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ENCYCLOPEDIC ENTRY

Climate change.

Climate change is a long-term shift in global or regional climate patterns. Often climate change refers specifically to the rise in global temperatures from the mid-20th century to present.

Earth Science, Climatology

Fracking tower

Fracking is a controversial form of drilling that uses high-pressure liquid to create cracks in underground shale to extract natural gas and petroleum. Carbon emissions from fossils fuels like these have been linked to global warming and climate change.

Photograph by Mark Thiessen / National Geographic

Climate is sometimes mistaken for weather. But climate is different from weather because it is measured over a long period of time, whereas weather can change from day to day, or from year to year. The climate of an area includes seasonal temperature and rainfall averages, and wind patterns. Different places have different climates. A desert, for example, is referred to as an arid climate because little water falls, as rain or snow, during the year. Other types of climate include tropical climates, which are hot and humid , and temperate climates, which have warm summers and cooler winters.

Climate change is the long-term alteration of temperature and typical weather patterns in a place. Climate change could refer to a particular location or the planet as a whole. Climate change may cause weather patterns to be less predictable. These unexpected weather patterns can make it difficult to maintain and grow crops in regions that rely on farming because expected temperature and rainfall levels can no longer be relied on. Climate change has also been connected with other damaging weather events such as more frequent and more intense hurricanes, floods, downpours, and winter storms.

In polar regions, the warming global temperatures associated with climate change have meant ice sheets and glaciers are melting at an accelerated rate from season to season. This contributes to sea levels rising in different regions of the planet. Together with expanding ocean waters due to rising temperatures, the resulting rise in sea level has begun to damage coastlines as a result of increased flooding and erosion.

The cause of current climate change is largely human activity, like burning fossil fuels , like natural gas, oil, and coal. Burning these materials releases what are called greenhouse gases into Earth’s atmosphere . There, these gases trap heat from the sun’s rays inside the atmosphere causing Earth’s average temperature to rise. This rise in the planet's temperature is called global warming. The warming of the planet impacts local and regional climates. Throughout Earth's history, climate has continually changed. When occuring naturally, this is a slow process that has taken place over hundreds and thousands of years. The human influenced climate change that is happening now is occuring at a much faster rate.

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What is climate change and why does it matter?

Climate change is the defining issue of our time . We have reached a pivotal moment in deciding our planet's future.

Find out what climate change is, why it matters and what it could mean for our collective future.

What are weather, climate and climate change?

Weather refers to atmospheric conditions, such as rain or snow, happening in a place at a specific moment in time. Climate is how much, on average, a type of weather will occur over a longer period.

Dr Joeri Rogelj is a climate scientist at Imperial College London's Grantham Institute who has contributed to and led several major climate change assessments. He explains, 'Climate change is how the characteristics of the weather we experience in a certain place change.

'It can get hotter or wetter on average or have more concentrated rain in a short period, but then get longer dry periods. All of that can be a result of climate change.'

Global warming is a term used interchangeably with climate change, although the latter is preferred because the warming atmosphere and oceans are just some of the effects we see.

'It's not just about temperature. Places are also becoming wetter or drier, and in some the seasons are moving. Most importantly, in a few regions and seasons, it may actually at times be cooler than we're used to. That's confusing if you just talk about global warming.'

This is Typhoon Utor, which affected the Philippines and China in 2013. It caused considerable damage and loss of life. Climate change influences most weather events, including tropical storms and hurricanes. © NASA Goddard Space Flight Center via Flickr ( CC BY 2.0 )

Causes of climate change

The main driver of current climate change is the emission of greenhouse gases, most importantly carbon dioxide and methane . These are primarily released when fossil fuels are burnt. Meat and dairy production, producing cement and some industrial processes, such as the production and use of fertilisers, also emit greenhouse gases.

Greenhouse gases trap heat in our atmosphere. Since the mid-nineteenth century , the world has emitted over 2.2 trillion tonnes of carbon dioxide.

Joeri explains, 'Energy from the Sun falls on our planet and normally gets reflected back as infrared radiation. But instead of escaping back out into space, this radiation gets absorbed by molecules of greenhouse gases, which then emit them in all directions.'

This process causes more heat to be kept near Earth's surface, warming our world.

How do we know climate is changing?

There are measuring stations all around the world that keep track of air and sea temperature. From these measurements it's clear that temperatures are rising.

'There are many more indicators that tell us that the Earth is warming. For example, on a warming planet we would expect polar ice caps and glaciers to melt. It is clearly observed that those are melting,' explains Joeri.

This image of an iceberg in McMurdo Sound was captured in 2017 as part of NASA's Operation IceBridge. This is an ongoing airborne mission to monitor changes in polar ice. © NASA Goddard Space Flight Center via Flickr ( CC BY 2.0 )

We know that greenhouse gases are causing change. Thanks to studies that look at how carbon dioxide absorbs infrared radiation, for example, there is a scientific understanding of how the planet would warm as a result of emissions. This has allowed climate scientists to discount the theory that global warming is being caused by an increase in the Sun's intensity, for example.

It's also known that greenhouse gases are primarily emitted by fossil fuel combustion.

'To burn carbon and produce carbon dioxide, you need oxygen. The amount of oxygen that is in the atmosphere is reducing at exactly the right amount for the increase in carbon dioxide to be caused by combusting fossil fuels,' explains Joeri.

There is additional evidence in the ratios of different types of carbon. Fossil fuels are, essentially, ancient plants . Plants now and in the past preferentially take up carbon-12. In normal conditions, the ratio between carbon-12 and carbon-13 is constant.

'What we can see is that the ratio of carbon-13 in our atmosphere is going down at exactly the rate you would predict if the carbon dioxide increase was due to burning fossil fuels.'

Scientists predict that climate change will cause extreme weather events such as wildfires, floods and hurricanes to become worse ©  Quarrie Photography via Flickr ( CC BY-NC-ND 2.0 )

Effects of climate change

Climate change does not have the same effects everywhere. The planet is generally getting hotter, but some regions and seasons can at times be temporarily cooler. Some places will see drawn-out seasons, while others may experience concentrated bursts of extreme weather.

Extreme weather events - such as hurricanes, floods, heatwaves , drought and  wildfires  - are predicted to become more intense and frequent.

'Pretty much any weather event is influenced by climate change. As scientists we can estimate how much climate change has made a certain event more likely or more intense than it would have been without climate change,' explains Joeri.

When the world warms, ice melts. Arctic sea ice could disappear entirely in a warming world, and Greenland and Antarctica's ice sheets could be destabilised. This would result in large sections melting, which would add more liquid to the ocean. 

Sea level rise caused by climate change is a threat to low lying islands such as Panama's idyllic San Blas Islands, 49 of which are inhabited © Marc Veraart via Flickr ( CC BY-ND 2.0 )

Ice also reflects the Sun's energy, so without ice, more heat is absorbed by the ocean . Water expands as it warms - this is known as thermal expansion. This effect means that the ocean takes up more space, causing sea levels to rise. Even with rapid emission cuts, sea levels are expected to rise by around 26 to 53 centimetres by 2100.

Along with melting ice sheets and glaciers, rising global temperatures could cause rainforests to die and widespread species extinctions.

The effects of climate change on us

How climate change will affect you depends on who you are and where you live.

Around 190 million people currently live in areas that, due to rising sea levels, are expected to be under high tide levels by 2100. This could cause a massive displacement of populations. Low lying atoll nations such as Tuvalu and the Maldives are incredibly vulnerable to this change and could be lost to the sea.

Hundreds of millions of people rely on seafood as their main source of protein. Warming and more acidic waters could destroy marine food chains by affecting their base, such as krill or coral reefs .

Longer-lasting drought could devastate crops, threating food security. Reservoirs drying up , as well as the loss of glaciers, could make drinking water scarce. 

Pasterze Glacier is estimated to be receding at a rate of 10 metres per year. A sign shows where the glacier lay in 1995, with the ice having since dramatically retreated up the valley. ©  H Raab via Flickr ( CC BY-NC-ND 2.0 )

Increased precipitation can cause deadly flooding, as well as lowering indoor air quality. This could affect our health as dampness benefits moulds and fungi.

Around four billion people live in urban areas, and by 2050 this will have risen to an estimated 6.7 billion.

City dwellers are not exempt from climate change's effects. Urban populations usually rely on rural areas for inputs such as food and water. If climate change disrupts these important connections, it could heavily affect those in urban areas.

Natural disasters impact poor and vulnerable populations disproportionately hard and clearly expose the consequences of ignoring social inequalities . With extreme weather increasing, these populations face a heightened level of risk.

For example, the urban heat island effect amplifies the effects of temperature extremes in cities. Those unable to afford to buy and run air conditioning may find their health compromised.

The hazards of climate change also do  disproportionate harm to women and girls .

Joeri says, 'We don't know what will happen when, exactly. It's really hard to anticipate, particularly for populations that are already on the edge every year.'

People are also seeing climate change impact their mental health, experiencing a phenomenon known as eco-anxiety . 

Differences in wealth, ethnicity and health are just some of the inequalities that could determine a person's vulnerability to the effects of climate change © Kompas/Hendra A Setyawan via World Meteorological Organization Flickr ( CC BY-NC-ND 2.0 )

How does climate change affect biodiversity?

The natural world is delicately balanced . No species - including ours - is completely independent of all others. A 2019 report confirmed that over one million animal and plant species are now at risk of extinction as a result of human activities.

In the UK, an analysis of over 700 species has shown that more than 80% of trends between 1976 and 2005 indicate seasonal events are happening earlier. Differing rates of change could mean that species' lives are no longer synchronised with those they rely on.

Many plants are flowering earlier. Migrating birds arrive earlier, leave later and some even are getting smaller . Butterflies are emerging earlier . Birds and amphibians are laying their eggs earlier in the year. Some species are moving into new areas, such as kelps which form vital marine habitats.

Seaweeds are important for many reasons . They act as vital habitats. Some also help protect coastlines from erosion.

Insects are one of the most vulnerable groups, with less ability than mammals or birds to escape warmer temperatures. Loss of insects, which are a primary food source for many animals, a key pollinator of plants and whose numbers are already plummeting , could cause the ecosystem to collapse.

In aquatic ecosystems, activities to mitigate the side effects of climate change, such as building hard flood defences, can have negative effects. As sea levels rise, sea walls reduce the space for intertidal ecosystems. A rising sea could also damage important coastal habitats like sand dunes and cliffs.

Joeri says, 'The ocean looks homogenous, but it also experiences variations. There are ocean heatwaves, where if a particularly warm mass of water comes to an area like coral reefs, it induces loss and mass dieback.'

The loss of Arctic sea ice takes away a key habitat from animals including polar bears, seals and walruses. The ice is now declining at a rate of more than 12% per decade .

Climate change is just one of the stressors currently impacting nature. Sea use, invasive species, pollution and the exploitation of organisms are all factors in the threat to nature. Without drastic changes , it's expected that there will be devastating changes in biodiversity and ecosystems.

Find out more about the link between climate change and the biodiversity crisis . 

A warming planet and melting ice threatens the survival of iconic animals such as polar bears © Gary Kramer/USFWS via U.S. Fish and Wildlife Service Flick r ( CC BY 2.0 )

Is there any hope for the future?

Climate change has been a known problem for around 30 years. Starting to fix it earlier might have made this daunting task much easier.

Joeri says, 'We definitely know how to reduce emissions to a significant degree. We are seeing more impacts of climate change, but we can also see a heightened interest and concern in the general public.

'Ultimately, reducing emissions is really an issue of public and political will.'

By understanding more about the planet, such as by studying the poles, scientists are able to estimate the consequences climate change will have © NASA Goddard Space Flight Center via Flickr ( CC BY 2.0 )

Over the past decades, scientists have estimated the potential impacts of the planet's average temperature rising by different amounts.

'Based on that information, governments have come together and decided that they don't want to exceed a 2°C rise. They want to be well below that and pursue efforts to make it as close as possible to 1.5 °C.'

The difference in outcomes between 1.5 and 2°C are considerable. The impacts are the difference of 70% or 99% of coral reefs dying or a summer free of Arctic sea ice once every 100 or 10 years.

Scientists have determined how much carbon dioxide can still be emitted before this temperature rise limit will be exceeded. This is called the carbon budget and it's relatively small.

Joeri says, 'It's currently 420 to 580 billion tonnes of carbon dioxide for having a two-in-three or a one-in-two chance of limiting warming to 1.5°C, starting to count in 2018.

'Today we are roughly emitting 42 billion tonnes a year. So, if you start today and are going to net-zero emissions , if you want a one-in-two chance, we should there by around mid-century.

'These numbers define the geophysical requirement. Scientists then use engineering and economic models to understand how we can transform society to stay within that emission limit.'

There are many ways that you can help the planet . One way is by reducing the amount of meat and dairy you eat. © Theo Stikkelman via Flickr ( CC BY 2.0 )

This transformation could include changes such as increasing the share of energy produced by renewables , changing the way food is produced , changing our diets to have a lower carbon footprint and changing the way we build houses and design cities .

Moving to net-zero emissions will not be a perfectly co-ordinated transition . It will take some countries to lead and show the world that moving to this new way of living and functioning is both possible and beneficial for other sustainability objectives, such as public health and food security.

But on whether we'll ever see a change for the better, Joeri says he's hopeful.

'Preferably we would have started 25 or 30 years ago, but I will take any year at which we start declining steadily towards net-zero.'

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Climate Change: Evidence and Causes: Update 2020 (2020)

Chapter: conclusion, c onclusion.

This document explains that there are well-understood physical mechanisms by which changes in the amounts of greenhouse gases cause climate changes. It discusses the evidence that the concentrations of these gases in the atmosphere have increased and are still increasing rapidly, that climate change is occurring, and that most of the recent change is almost certainly due to emissions of greenhouse gases caused by human activities. Further climate change is inevitable; if emissions of greenhouse gases continue unabated, future changes will substantially exceed those that have occurred so far. There remains a range of estimates of the magnitude and regional expression of future change, but increases in the extremes of climate that can adversely affect natural ecosystems and human activities and infrastructure are expected.

Citizens and governments can choose among several options (or a mixture of those options) in response to this information: they can change their pattern of energy production and usage in order to limit emissions of greenhouse gases and hence the magnitude of climate changes; they can wait for changes to occur and accept the losses, damage, and suffering that arise; they can adapt to actual and expected changes as much as possible; or they can seek as yet unproven “geoengineering” solutions to counteract some of the climate changes that would otherwise occur. Each of these options has risks, attractions and costs, and what is actually done may be a mixture of these different options. Different nations and communities will vary in their vulnerability and their capacity to adapt. There is an important debate to be had about choices among these options, to decide what is best for each group or nation, and most importantly for the global population as a whole. The options have to be discussed at a global scale because in many cases those communities that are most vulnerable control few of the emissions, either past or future. Our description of the science of climate change, with both its facts and its uncertainties, is offered as a basis to inform that policy debate.

A CKNOWLEDGEMENTS

The following individuals served as the primary writing team for the 2014 and 2020 editions of this document:

• Eric Wolff FRS, (UK lead), University of Cambridge
• Inez Fung (NAS, US lead), University of California, Berkeley
• Brian Hoskins FRS, Grantham Institute for Climate Change
• John F.B. Mitchell FRS, UK Met Office
• Tim Palmer FRS, University of Oxford
• Benjamin Santer (NAS), Lawrence Livermore National Laboratory
• John Shepherd FRS, University of Southampton
• Keith Shine FRS, University of Reading.
• Susan Solomon (NAS), Massachusetts Institute of Technology
• Kevin Trenberth, National Center for Atmospheric Research
• John Walsh, University of Alaska, Fairbanks
• Don Wuebbles, University of Illinois

Staff support for the 2020 revision was provided by Richard Walker, Amanda Purcell, Nancy Huddleston, and Michael Hudson. We offer special thanks to Rebecca Lindsey and NOAA Climate.gov for providing data and figure updates.

The following individuals served as reviewers of the 2014 document in accordance with procedures approved by the Royal Society and the National Academy of Sciences:

• Richard Alley (NAS), Department of Geosciences, Pennsylvania State University
• Alec Broers FRS, Former President of the Royal Academy of Engineering
• Harry Elderfield FRS, Department of Earth Sciences, University of Cambridge
• Joanna Haigh FRS, Professor of Atmospheric Physics, Imperial College London
• Isaac Held (NAS), NOAA Geophysical Fluid Dynamics Laboratory
• John Kutzbach (NAS), Center for Climatic Research, University of Wisconsin
• Jerry Meehl, Senior Scientist, National Center for Atmospheric Research
• John Pendry FRS, Imperial College London
• John Pyle FRS, Department of Chemistry, University of Cambridge
• Gavin Schmidt, NASA Goddard Space Flight Center
• Emily Shuckburgh, British Antarctic Survey
• Gabrielle Walker, Journalist
• Andrew Watson FRS, University of East Anglia

The Support for the 2014 Edition was provided by NAS Endowment Funds. We offer sincere thanks to the Ralph J. and Carol M. Cicerone Endowment for NAS Missions for supporting the production of this 2020 Edition.

F OR FURTHER READING

For more detailed discussion of the topics addressed in this document (including references to the underlying original research), see:

• Intergovernmental Panel on Climate Change (IPCC), 2019: Special Report on the Ocean and Cryosphere in a Changing Climate [ https://www.ipcc.ch/srocc ]
• National Academies of Sciences, Engineering, and Medicine (NASEM), 2019: Negative Emissions Technologies and Reliable Sequestration: A Research Agenda [ https://www.nap.edu/catalog/25259 ]
• Royal Society, 2018: Greenhouse gas removal [ https://raeng.org.uk/greenhousegasremoval ]
• U.S. Global Change Research Program (USGCRP), 2018: Fourth National Climate Assessment Volume II: Impacts, Risks, and Adaptation in the United States [ https://nca2018.globalchange.gov ]
• IPCC, 2018: Global Warming of 1.5°C [ https://www.ipcc.ch/sr15 ]
• USGCRP, 2017: Fourth National Climate Assessment Volume I: Climate Science Special Reports [ https://science2017.globalchange.gov ]
• NASEM, 2016: Attribution of Extreme Weather Events in the Context of Climate Change [ https://www.nap.edu/catalog/21852 ]
• IPCC, 2013: Fifth Assessment Report (AR5) Working Group 1. Climate Change 2013: The Physical Science Basis [ https://www.ipcc.ch/report/ar5/wg1 ]
• NRC, 2013: Abrupt Impacts of Climate Change: Anticipating Surprises [ https://www.nap.edu/catalog/18373 ]
• NRC, 2011: Climate Stabilization Targets: Emissions, Concentrations, and Impacts Over Decades to Millennia [ https://www.nap.edu/catalog/12877 ]
• Royal Society 2010: Climate Change: A Summary of the Science [ https://royalsociety.org/topics-policy/publications/2010/climate-change-summary-science ]
• NRC, 2010: America’s Climate Choices: Advancing the Science of Climate Change [ https://www.nap.edu/catalog/12782 ]

Much of the original data underlying the scientific findings discussed here are available at:

• https://data.ucar.edu/
• https://climatedataguide.ucar.edu
• https://iridl.ldeo.columbia.edu
• https://ess-dive.lbl.gov/
• https://www.ncdc.noaa.gov/
• https://www.esrl.noaa.gov/gmd/ccgg/trends/
• http://scrippsco2.ucsd.edu
• http://hahana.soest.hawaii.edu/hot/

Climate change is one of the defining issues of our time. It is now more certain than ever, based on many lines of evidence, that humans are changing Earth's climate. The Royal Society and the US National Academy of Sciences, with their similar missions to promote the use of science to benefit society and to inform critical policy debates, produced the original Climate Change: Evidence and Causes in 2014. It was written and reviewed by a UK-US team of leading climate scientists. This new edition, prepared by the same author team, has been updated with the most recent climate data and scientific analyses, all of which reinforce our understanding of human-caused climate change.

Scientific information is a vital component for society to make informed decisions about how to reduce the magnitude of climate change and how to adapt to its impacts. This booklet serves as a key reference document for decision makers, policy makers, educators, and others seeking authoritative answers about the current state of climate-change science.

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What Is Climate Change?

Climate change refers to long-term shifts in temperatures and weather patterns. Such shifts can be natural, due to changes in the sun’s activity or large volcanic eruptions. But since the 1800s, human activities have been the main driver of climate change , primarily due to the burning of fossil fuels like coal, oil and gas.

Burning fossil fuels generates greenhouse gas emissions that act like a blanket wrapped around the Earth, trapping the sun’s heat and raising temperatures.

The main greenhouse gases that are causing climate change include carbon dioxide and methane. These come from using gasoline for driving a car or coal for heating a building, for example. Clearing land and cutting down forests can also release carbon dioxide. Agriculture, oil and gas operations are major sources of methane emissions. Energy, industry, transport, buildings, agriculture and land use are among the main sectors  causing greenhouse gases.

Humans are responsible for global warming

Climate scientists have showed that humans are responsible for virtually all global heating over the last 200 years. Human activities like the ones mentioned above are causing greenhouse gases that are warming the world faster than at any time in at least the last two thousand years.

The average temperature of the Earth’s surface is now about 1.1°C warmer than it was in the late 1800s (before the industrial revolution) and warmer than at any time in the last 100,000 years. The last decade (2011-2020) was the warmest on record , and each of the last four decades has been warmer than any previous decade since 1850.

Many people think climate change mainly means warmer temperatures. But temperature rise is only the beginning of the story. Because the Earth is a system, where everything is connected, changes in one area can influence changes in all others.

The consequences of climate change now include, among others, intense droughts, water scarcity, severe fires, rising sea levels, flooding, melting polar ice, catastrophic storms and declining biodiversity.

People are experiencing climate change in diverse ways

Climate change can affect our health , ability to grow food, housing, safety and work. Some of us are already more vulnerable to climate impacts, such as people living in small island nations and other developing countries. Conditions like sea-level rise and saltwater intrusion have advanced to the point where whole communities have had to relocate, and protracted droughts are putting people at risk of famine. In the future, the number of people displaced by weather-related events is expected to rise.

Every increase in global warming matters

In a series of UN reports , thousands of scientists and government reviewers agreed that limiting global temperature rise to no more than 1.5°C would help us avoid the worst climate impacts and maintain a livable climate. Yet policies currently in place point to a 3°C temperature rise by the end of the century.

The emissions that cause climate change come from every part of the world and affect everyone, but some countries produce much more than others .The seven biggest emitters alone (China, the United States of America, India, the European Union, Indonesia, the Russian Federation, and Brazil) accounted for about half of all global greenhouse gas emissions in 2020.

Everyone must take climate action, but people and countries creating more of the problem have a greater responsibility to act first.

We face a huge challenge but already know many solutions

Many climate change solutions can deliver economic benefits while improving our lives and protecting the environment. We also have global frameworks and agreements to guide progress, such as the Sustainable Development Goals , the UN Framework Convention on Climate Change and the Paris Agreement . Three broad categories of action are: cutting emissions, adapting to climate impacts and financing required adjustments.

Switching energy systems from fossil fuels to renewables like solar or wind will reduce the emissions driving climate change. But we have to act now. While a growing number of countries is committing to net zero emissions by 2050, emissions must be cut in half by 2030 to keep warming below 1.5°C. Achieving this means huge declines in the use of coal, oil and gas: over two-thirds of today’s proven reserves of fossil fuels need to be kept in the ground by 2050 in order to prevent catastrophic levels of climate change.

Adapting to climate consequences protects people, homes, businesses, livelihoods, infrastructure and natural ecosystems. It covers current impacts and those likely in the future. Adaptation will be required everywhere, but must be prioritized now for the most vulnerable people with the fewest resources to cope with climate hazards. The rate of return can be high. Early warning systems for disasters, for instance, save lives and property, and can deliver benefits up to 10 times the initial cost.

We can pay the bill now, or pay dearly in the future

Climate action requires significant financial investments by governments and businesses. But climate inaction is vastly more expensive. One critical step is for industrialized countries to fulfil their commitment to provide $100 billion a year to developing countries so they can adapt and move towards greener economies.

To get familiar with some of the more technical terms used in connection with climate change, consult the Climate Dictionary .

Learn more about…

The facts on climate and energy

Climate change is a hot topic – with myths and falsehoods circulating widely. Find some essential facts here .

The science

See the latest climate reports from the United Nations as well as climate action facts .

Causes and Effects

Fossil fuels are by far the largest contributor to the greenhouse gas emissions that cause climate change, which poses many risks to all forms of life on Earth. Learn more .

From the Secretary-General

Read the UN Chief’s latest statements on climate action.

What is net zero? Why is it important? Our  net-zero page  explains why we need steep emissions cuts now and what efforts are underway.

Renewable energy – powering a safer future

What is renewable energy and why does it matter? Learn more about why the shift to renewables is our only hope for a brighter and safer world.

How will the world foot the bill? We explain the issues and the value of financing climate action.

What is climate adaptation? Why is it so important for every country? Find out how we can protect lives and livelihoods as the climate changes.

Climate Issues

Learn more about how climate change impacts are felt across different sectors and ecosystems.

Why women are key to climate action

Women and girls are on the frontlines of the climate crisis and uniquely situated to drive action. Find out why it’s time to invest in women.

Facts and figures

• What is climate change?
• Causes and effects
• Myth busters

Cutting emissions

• Explaining net zero
• High-level expert group on net zero
• Checklists for credibility of net-zero pledges
• Greenwashing
• What you can do

Clean energy

• Renewable energy – key to a safer future
• What is renewable energy
• Five ways to speed up the energy transition
• Why invest in renewable energy
• Clean energy stories
• A just transition

Adapting to climate change

• Climate adaptation
• Early warnings for all
• Youth voices

Financing climate action

• Finance and justice
• Loss and damage
• $100 billion commitment
• Why finance climate action
• Biodiversity
• Human Security

International cooperation

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How global warming is disrupting life on Earth

The signs of global warming are everywhere, and are more complex than just climbing temperatures.

Our planet is getting hotter. Since the Industrial Revolution—an event that spurred the use of fossil fuels in everything from power plants to transportation—Earth has warmed by 1 degree Celsius, about 2 degrees Fahrenheit.  

That may sound insignificant, but 2023 was the hottest year on record , and all 10 of the hottest years on record have occurred in the past decade.  

Global warming and climate change are often used interchangeably as synonyms, but scientists prefer to use “climate change” when describing the complex shifts now affecting our planet’s weather and climate systems.  

Climate change encompasses not only rising average temperatures but also natural disasters, shifting wildlife habitats, rising seas , and a range of other impacts. All of these changes are emerging as humans continue to add heat-trapping greenhouse gases , like carbon dioxide and methane, to the atmosphere.

What causes global warming?

When fossil fuel emissions are pumped into the atmosphere, they change the chemistry of our atmosphere, allowing sunlight to reach the Earth but preventing heat from being released into space. This keeps Earth warm, like a greenhouse, and this warming is known as the greenhouse effect .  

Carbon dioxide is the most commonly found greenhouse gas and about 75 percent of all the climate warming pollution in the atmosphere. This gas is a product of producing and burning oil, gas, and coal. About a quarter of Carbon dioxide also results from land cleared for timber or agriculture.  

Methane is another common greenhouse gas. Although it makes up only about 16 percent of emissions, it's roughly 25 times more potent than carbon dioxide and dissipates more quickly. That means methane can cause a large spark in warming, but ending methane pollution can also quickly limit the amount of atmospheric warming. Sources of this gas include agriculture (mostly livestock), leaks from oil and gas production, and waste from landfills.  

What are the effects of global warming?  

One of the most concerning impacts of global warming is the effect warmer temperatures will have on Earth's polar regions and mountain glaciers. The Arctic is warming four times faster than the rest of the planet. This warming reduces critical ice habitat and it disrupts the flow of the jet stream, creating more unpredictable weather patterns around the globe.  

( Learn more about the jet stream. )

A warmer planet doesn't just raise temperatures. Precipitation is becoming more extreme as the planet heats. For every degree your thermometer rises, the air holds about seven percent more moisture. This increase in moisture in the atmosphere can produce flash floods, more destructive hurricanes, and even paradoxically, stronger snow storms.  

The world's leading scientists regularly gather to review the latest research on how the planet is changing. The results of this review is synthesized in regularly published reports known as the Intergovernmental Panel on Climate Change (IPCC) reports.  

A recent report outlines how disruptive a global rise in temperature can be:

• Coral reefs are now a highly endangered ecosystem. When corals face environmental stress, such as high heat, they expel their colorful algae and turn a ghostly white, an effect known as coral bleaching . In this weakened state, they more easily die.  
• Trees are increasingly dying from drought , and this mass mortality is reshaping forest ecosystems.
• Rising temperatures and changing precipitation patterns are making wildfires more common and more widespread. Research shows they're even moving into the eastern U.S. where fires have historically been less common.
• Hurricanes are growing more destructive and dumping more rain, an effect that will result in more damage. Some scientists say we even need to be preparing for Cat 6 storms . (The current ranking system ends at Cat 5.)

How can we limit global warming?  

Limiting the rising in global warming is theoretically achievable, but politically, socially, and economically difficult.  

Those same sources of greenhouse gas emissions must be limited to reduce warming. For example, oil and gas used to generate electricity or power industrial manufacturing will need to be replaced by net zero emission technology like wind and solar power. Transportation, another major source of emissions, will need to integrate more electric vehicles, public transportation, and innovative urban design, such as safe bike lanes and walkable cities.  

( Learn more about solutions to limit global warming. )

One global warming solution that was once considered far fetched is now being taken more seriously: geoengineering. This type of technology relies on manipulating the Earth's atmosphere to physically block the warming rays of the sun or by sucking carbon dioxide straight out of the sky.

Restoring nature may also help limit warming. Trees, oceans, wetlands, and other ecosystems help absorb excess carbon—but when they're lost, so too is their potential to fight climate change.  

Ultimately, we'll need to adapt to warming temperatures, building homes to withstand sea level rise for example, or more efficiently cooling homes during heat waves.  

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The Causes of Climate Change

Human activities are driving the global warming trend observed since the mid-20th century.

• The greenhouse effect is essential to life on Earth, but human-made emissions in the atmosphere are trapping and slowing heat loss to space.
• Five key greenhouse gases are carbon dioxide, nitrous oxide, methane, chlorofluorocarbons, and water vapor.
• While the Sun has played a role in past climate changes, the evidence shows the current warming cannot be explained by the Sun.

Increasing Greenhouses Gases Are Warming the Planet

Scientists attribute the global warming trend observed since the mid-20 th century to the human expansion of the "greenhouse effect" 1 — warming that results when the atmosphere traps heat radiating from Earth toward space.

Life on Earth depends on energy coming from the Sun. About half the light energy reaching Earth's atmosphere passes through the air and clouds to the surface, where it is absorbed and radiated in the form of infrared heat. About 90% of this heat is then absorbed by greenhouse gases and re-radiated, slowing heat loss to space.

Four Major Gases That Contribute to the Greenhouse Effect

Carbon dioxide.

A vital component of the atmosphere, carbon dioxide (CO 2 ) is released through natural processes (like volcanic eruptions) and through human activities, such as burning fossil fuels and deforestation.

Like many atmospheric gases, methane comes from both natural and human-caused sources. Methane comes from plant-matter breakdown in wetlands and is also released from landfills and rice farming. Livestock animals emit methane from their digestion and manure. Leaks from fossil fuel production and transportation are another major source of methane, and natural gas is 70% to 90% methane.

Nitrous Oxide

A potent greenhouse gas produced by farming practices, nitrous oxide is released during commercial and organic fertilizer production and use. Nitrous oxide also comes from burning fossil fuels and burning vegetation and has increased by 18% in the last 100 years.

Chlorofluorocarbons (CFCs)

These chemical compounds do not exist in nature – they are entirely of industrial origin. They were used as refrigerants, solvents (a substance that dissolves others), and spray can propellants.

FORCING:  Something acting upon Earth's climate that causes a change in how energy flows through it (such as long-lasting, heat-trapping gases - also known as greenhouse gases). These gases slow outgoing heat in the atmosphere and cause the planet to warm.

Another Gas That Contributes to the Greenhouse Effect:

Water vapor.

Water vapor is the most abundant greenhouse gas, but because the warming ocean increases the amount of it in our atmosphere, it is not a direct cause of climate change. Credit:  John Fowler  on  Unsplash

FEEDBACKS:  A process where something is either amplified or reduced as time goes on, such as water vapor increasing as Earth warms leading to even more warming.

Human Activity Is the Cause of Increased Greenhouse Gas Concentrations

Over the last century, burning of fossil fuels like coal and oil has increased the concentration of atmospheric carbon dioxide (CO 2 ). This increase happens because the coal or oil burning process combines carbon with oxygen in the air to make CO 2 . To a lesser extent, clearing of land for agriculture, industry, and other human activities has increased concentrations of greenhouse gases.

The industrial activities that our modern civilization depends upon have raised atmospheric carbon dioxide levels by nearly 50% since 1750 2 . This increase is due to human activities, because scientists can see a distinctive isotopic fingerprint in the atmosphere.

In its Sixth Assessment Report, the Intergovernmental Panel on Climate Change, composed of scientific experts from countries all over the world, concluded that it is unequivocal that the increase of CO 2 , methane, and nitrous oxide in the atmosphere over the industrial era is the result of human activities and that human influence is the principal driver of many changes observed across the atmosphere, ocean, cryosphere and biosphere.

"Since systematic scientific assessments began in the 1970s, the influence of human activity on the warming of the climate system has evolved from theory to established fact."

Intergovernmental Panel on Climate Change

The panel's AR6 Working Group I (WGI) Summary for Policymakers report is online at https://www.ipcc.ch/report/ar6/wg1/ .

Evidence Shows That Current Global Warming Cannot Be Explained by Solar Irradiance

Scientists use a metric called Total Solar Irradiance (TSI) to measure the changes in energy the Earth receives from the Sun. TSI incorporates the 11-year solar cycle and solar flares/storms from the Sun's surface.

Studies show that solar variability has played a role in past climate changes. For example, a decrease in solar activity coupled with increased volcanic activity helped trigger the Little Ice Age.

But several lines of evidence show that current global warming cannot be explained by changes in energy from the Sun:

• Since 1750, the average amount of energy from the Sun either remained constant or decreased slightly 3 .
• If a more active Sun caused the warming, scientists would expect warmer temperatures in all layers of the atmosphere. Instead, they have observed a cooling in the upper atmosphere and a warming at the surface and lower parts of the atmosphere. That's because greenhouse gases are slowing heat loss from the lower atmosphere.
• Climate models that include solar irradiance changes can’t reproduce the observed temperature trend over the past century or more without including a rise in greenhouse gases.

1. IPCC 6 th Assessment Report, WG1, Summary for Policy Makers, Sections A, “ The Current State of the Climate ”

IPCC 6 th Assessment Report, WG1, Technical Summary, Sections TS.1.2, TS.2.1 and TS.3.1

2. P. Friedlingstein, et al., 2022: “Global Carbon Budget 2022”, Earth System Science Data ( 11 Nov 2022): 4811–4900. https://doi.org/10.5194/essd-14-4811-2022

3. IPCC 6 th Assessment Report, WG1, Chapter 2, Section 2.2.1, “ Solar and Orbital Forcing ” IPCC 6 th Assessment Report, WG1, Chapter 7, Sections 7.3.4.4, 7.3.5.2, Figure 7.6, “ Solar ” M. Lockwood and W.T. Ball, Placing limits on long-term variations in quiet-Sun irradiance and their contribution to total solar irradiance and solar radiative forcing of climate,” Proceedings of the Royal Society A , 476, issue 2228 (24 June 2020): https://doi 10.1098/rspa.2020.0077

Header image credit: Pixabay/stevepb Four Major Gases image credit: Adobe Stock/Ilya Glovatskiy

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Facts About Earth

How Cloud Seeding Works and Why It’s Wrongly Blamed for Floods From Dubai to California

I n a place as dry as the desert city of Dubai, whenever they can get rain, they’ll take it.

United Arab Emirates authorities will often even try to make it rain—as they did earlier this week when the National Center of Meteorology dispatched planes to inject chemicals into the clouds to try to coax some showering.

But this time they got much more than they wanted. Dubai faced torrential downpours on Tuesday, with flooding shutting down much of the city, including schools and its major airport— killing at least one man whose car was swept away as well as at least 18 others in neighboring Oman, including a bus full of schoolchildren.

The UAE government media office said it was the heaviest rainfall recorded in 75 years and called it “ an exceptional event .” More than a typical year’s worth of water was dumped on the country in a single day.

Now, many people are pointing a finger at the “cloud seeding” operations preceding the precipitation.

“Do you think the Dubai floods might have something to do with this?” popular social media account Wide Awake Media asked on X , alongside a clip of a news report on the UAE’s weather modification program.

But experts say that while cloud seeding may have enhanced the rainfall, pinning such a devastating downpour on it is misguided.

“It is very unlikely that cloud seeding would cause a flood,” Roslyn Prinsley, the head of disaster solutions at the Australian National University Institute for Climate, Energy and Disaster Solutions, tells TIME, describing such claims as “conspiracy theories.”

It’s not the first time cloud seeding has been blamed for floods—in Dubai and around the world. In February, social media users charged officials working on a cloud seeding pilot program in California with causing storms that hit the state, despite the technology not even being used before the storms in question. And in Australia in 2022, as the nation down under experienced record rainfall, social media users recirculated an old news clip that questioned if there was a link between cloud seeding and flooding—to which fact-checkers answered: there isn’t.

Here’s what to know about cloud seeding, how and whether it even works, and what scientists say people should actually be worried about.

How does cloud seeding work?

Cloud seeding basically works by artificially recreating the process by which rain and snow naturally occur: In normal clouds, microscopic droplets of water vapor are attracted to atmospheric aerosols like dust or pollen or salt from the sea. When enough water droplets converge around these nuclei, they form ice crystals and fall.

Clouds are seeded, typically by specially equipped aircraft but also by ground-based generators, by implanting particles, commonly silver iodide, in and around selected clouds to act as nuclei and trigger the precipitation process.

Does cloud seeding even work?

Since the futuristic-sounding weather modification technique was introduced in the 1940s, it has been used regularly across the world, from the UAE to China to the United States, for a wide range of intended purposes. Mostly employed by governments grappling with drought, cloud seeding has even found itself a part of some of the biggest events in history, from clearing urban pollution and ensuring blue skies at the 2008 Beijing Olympics, to staving away Moscow-bound radioactive clouds in the wake of a nuclear disaster in Chernobyl, to hampering the movement of U.S. enemies during the war in Vietnam. (Weather modification in warfare has since been banned by the U.N.)

For decades, a rain-scarce UAE has invested heavily in cloud seeding, including granting permanent residency to experts, and funding research programs to better identify the seedability of clouds.

But the science on just how effective cloud seeding is remains inconclusive. In 2003, the U.S. National Research Council concluded that “there still is no convincing scientific proof” of its efficacy at the time. A landmark 2020 study , however, found that cloud seeding does work—but researchers are clear about its limitations.

UAE meteorological officials say that their cloud seeding operations can increase rainfall by 10-30%, while Californian authorities’ estimates for their own program sit at 5-10%. The Desert Research Institute (DRI), the state of Nevada’s research group, says cloud seeding can increase seasonal precipitation by about 10% , while the World Meteorological Organization assessed in 2019 that the impacts of cloud seeding range from next to nothing to 20%. And success in producing rain depends significantly on atmospheric conditions such as wind and cloud temperatures. 

That’s why experts agree that cloud seeding tends to get a bad rap from the public. Its impact is often overstated, and while it can enhance rainfall, other natural and unnatural factors play a much greater role in causing floods.

Are there any concerns about cloud seeding?

A number of myths are associated with cloud seeding, such as that it causes what’s known as “chem-trails,” cloud-like streaks of white in the sky. DRI says those are actually “jet contrails, and they are the aviation equivalent of visible plumes of steamy breath on a cold morning.” They have “no connection with cloud-seeding activities.”

But there are other reasons for skepticism about cloud seeding.

Critics argue that seeding clouds in one region may simply deprive another of rain, as the clouds will unleash precipitation before they were meant to. (Iran has for years accused its neighbors of “stealing their rain.”)

Others have expressed health concerns about the chemicals used to seed clouds. Silver iodide, a common substance used, may be toxic to animals , though others insist it is safe .

In a publication for the Bulletin of Atomic Scientists, Laura Kuhl, a public policy professor at Northeastern University, argues that cloud seeding may do “more harm than good” due to these uncertainties and because, given its limited effectiveness, it promotes a sense of “techno-optimism” that “can obscure deeper structural drivers of vulnerability like unsustainable water use and unequal distribution of access to water.”

What’s to blame for floods?

The severity of the recent flooding in Dubai could be in large part because the perennially dry country hasn’t developed effective drainage infrastructure to deal with intense rainfall. But experts note that a major reason for such extreme weather events is climate change, since warmer air can hold more water , which then leads to heavier rainfall and floods in some areas. 

Prinsley says that when it comes to dealing with global warming and increasingly destructive weather phenomenon, people should be more concerned about human activities that “seed” the atmosphere with greenhouse gasses than with cloud seeding.

“Climate change on top of natural weather and climate processes is the cause of much of the extreme weather that we are seeing across the world. Cloud seeding is used to make recalcitrant clouds produce some rain,” she says. “The thunderstorms themselves are much more likely to have caused the extreme flooding in Dubai due to climate change-fuelled intense rainfall—as is happening across the world.”

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What Are the Causes of Climate Change?

We can’t fight climate change without understanding what drives it.

Low water levels at Shasta Lake, California, following a historic drought in October 2021

Andrew Innerarity/California Department of Water Resources

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At the root of climate change is the phenomenon known as the greenhouse effect , the term scientists use to describe the way that certain atmospheric gases “trap” heat that would otherwise radiate upward, from the planet’s surface, into outer space. On the one hand, we have the greenhouse effect to thank for the presence of life on earth; without it, our planet would be cold and unlivable.

But beginning in the mid- to late-19th century, human activity began pushing the greenhouse effect to new levels. The result? A planet that’s warmer right now than at any other point in human history, and getting ever warmer. This global warming has, in turn, dramatically altered natural cycles and weather patterns, with impacts that include extreme heat, protracted drought, increased flooding, more intense storms, and rising sea levels. Taken together, these miserable and sometimes deadly effects are what have come to be known as climate change .

Detailing and discussing the human causes of climate change isn’t about shaming people, or trying to make them feel guilty for their choices. It’s about defining the problem so that we can arrive at effective solutions. And we must honestly address its origins—even though it can sometimes be difficult, or even uncomfortable, to do so. Human civilization has made extraordinary productivity leaps, some of which have led to our currently overheated planet. But by harnessing that same ability to innovate and attaching it to a renewed sense of shared responsibility, we can find ways to cool the planet down, fight climate change , and chart a course toward a more just, equitable, and sustainable future.

Here’s a rough breakdown of the factors that are driving climate change.

Natural causes of climate change

Human-driven causes of climate change, transportation, electricity generation, industry & manufacturing, agriculture, oil & gas development, deforestation, our lifestyle choices.

Some amount of climate change can be attributed to natural phenomena. Over the course of Earth’s existence, volcanic eruptions , fluctuations in solar radiation , tectonic shifts , and even small changes in our orbit have all had observable effects on planetary warming and cooling patterns.

But climate records are able to show that today’s global warming—particularly what has occured since the start of the industrial revolution—is happening much, much faster than ever before. According to NASA , “[t]hese natural causes are still in play today, but their influence is too small or they occur too slowly to explain the rapid warming seen in recent decades.” And the records refute the misinformation that natural causes are the main culprits behind climate change, as some in the fossil fuel industry and conservative think tanks would like us to believe.

Chemical manufacturing plants emit fumes along Onondaga Lake in Solvay, New York, in the late-19th century. Over time, industrial development severely polluted the local area.

Library of Congress, Prints & Photographs Division, Detroit Publishing Company Collection

Scientists agree that human activity is the primary driver of what we’re seeing now worldwide. (This type of climate change is sometimes referred to as anthropogenic , which is just a way of saying “caused by human beings.”) The unchecked burning of fossil fuels over the past 150 years has drastically increased the presence of atmospheric greenhouse gases, most notably carbon dioxide . At the same time, logging and development have led to the widespread destruction of forests, wetlands, and other carbon sinks —natural resources that store carbon dioxide and prevent it from being released into the atmosphere.

Right now, atmospheric concentrations of greenhouse gases like carbon dioxide, methane , and nitrous oxide are the highest they’ve been in the last 800,000 years . Some greenhouse gases, like hydrochlorofluorocarbons (HFCs) , do not even exist in nature. By continuously pumping these gases into the air, we helped raise the earth’s average temperature by about 1.9 degrees Fahrenheit during the 20th century—which has brought us to our current era of deadly, and increasingly routine, weather extremes. And it’s important to note that while climate change affects everyone in some way, it doesn’t do so equally: All over the world, people of color and those living in economically disadvantaged or politically marginalized communities bear a much larger burden , despite the fact that these communities play a much smaller role in warming the planet.

Our ways of generating power for electricity, heat, and transportation, our built environment and industries, our ways of interacting with the land, and our consumption habits together serve as the primary drivers of climate change. While the percentages of greenhouse gases stemming from each source may fluctuate, the sources themselves remain relatively consistent.

Traffic on Interstate 25 in Denver

David Parsons/iStock

The cars, trucks, ships, and planes that we use to transport ourselves and our goods are a major source of global greenhouse gas emissions. (In the United States, they actually constitute the single-largest source.) Burning petroleum-based fuel in combustion engines releases massive amounts of carbon dioxide into the atmosphere. Passenger cars account for 41 percent of those emissions, with the typical passenger vehicle emitting about 4.6 metric tons of carbon dioxide per year. And trucks are by far the worst polluters on the road. They run almost constantly and largely burn diesel fuel, which is why, despite accounting for just 4 percent of U.S. vehicles, trucks emit 23 percent of all greenhouse gas emissions from transportation.

We can get these numbers down, but we need large-scale investments to get more zero-emission vehicles on the road and increase access to reliable public transit .

As of 2021, nearly 60 percent of the electricity used in the United States comes from the burning of coal, natural gas , and other fossil fuels . Because of the electricity sector’s historical investment in these dirty energy sources, it accounts for roughly a quarter of U.S. greenhouse gas emissions, including carbon dioxide, methane, and nitrous oxide.

That history is undergoing a major change, however: As renewable energy sources like wind and solar become cheaper and easier to develop, utilities are turning to them more frequently. The percentage of clean, renewable energy is growing every year—and with that growth comes a corresponding decrease in pollutants.

But while things are moving in the right direction, they’re not moving fast enough. If we’re to keep the earth’s average temperature from rising more than 1.5 degrees Celsius, which scientists say we must do in order to avoid the very worst impacts of climate change, we have to take every available opportunity to speed up the shift from fossil fuels to renewables in the electricity sector.

The factories and facilities that produce our goods are significant sources of greenhouse gases; in 2020, they were responsible for fully 24 percent of U.S. emissions. Most industrial emissions come from the production of a small set of carbon-intensive products, including basic chemicals, iron and steel, cement and concrete, aluminum, glass, and paper. To manufacture the building blocks of our infrastructure and the vast array of products demanded by consumers, producers must burn through massive amounts of energy. In addition, older facilities in need of efficiency upgrades frequently leak these gases, along with other harmful forms of air pollution .

One way to reduce the industrial sector’s carbon footprint is to increase efficiency through improved technology and stronger enforcement of pollution regulations. Another way is to rethink our attitudes toward consumption (particularly when it comes to plastics ), recycling , and reuse —so that we don’t need to be producing so many things in the first place. And, since major infrastructure projects rely heavily on industries like cement manufacturing (responsible for 7 percent of annual global greenhouse gas), policy mandates must leverage the government’s purchasing power to grow markets for cleaner alternatives, and ensure that state and federal agencies procure more sustainably produced materials for these projects. Hastening the switch from fossil fuels to renewables will also go a long way toward cleaning up this energy-intensive sector.

The advent of modern, industrialized agriculture has significantly altered the vital but delicate relationship between soil and the climate—so much so that agriculture accounted for 11 percent of U.S. greenhouse gas emissions in 2020. This sector is especially notorious for giving off large amounts of nitrous oxide and methane, powerful gases that are highly effective at trapping heat. The widespread adoption of chemical fertilizers , combined with certain crop-management practices that prioritize high yields over soil health, means that agriculture accounts for nearly three-quarters of the nitrous oxide found in our atmosphere. Meanwhile, large-scale industrialized livestock production continues to be a significant source of atmospheric methane, which is emitted as a function of the digestive processes of cattle and other ruminants.

Stephen McComber holds a squash harvested from the community garden in Kahnawà:ke Mohawk Territory, a First Nations reserve of the Mohawks of Kahnawà:ke, in Quebec.

Stephanie Foden for NRDC

But farmers and ranchers—especially Indigenous farmers, who have been tending the land according to sustainable principles —are reminding us that there’s more than one way to feed the world. By adopting the philosophies and methods associated with regenerative agriculture , we can slash emissions from this sector while boosting our soil’s capacity for sequestering carbon from the atmosphere, and producing healthier foods.

A decades-old, plugged and abandoned oil well at a cattle ranch in Crane County, Texas, in June 2021, when it was found to be leaking brine water

Matthew Busch/Bloomberg via Getty Images

Oil and gas lead to emissions at every stage of their production and consumption—not only when they’re burned as fuel, but just as soon as we drill a hole in the ground to begin extracting them. Fossil fuel development is a major source of methane, which invariably leaks from oil and gas operations : drilling, fracking , transporting, and refining. And while methane isn’t as prevalent a greenhouse gas as carbon dioxide, it’s many times more potent at trapping heat during the first 20 years of its release into the atmosphere. Even abandoned and inoperative wells—sometimes known as “orphaned” wells —leak methane. More than 3 million of these old, defunct wells are spread across the country and were responsible for emitting more than 280,000 metric tons of methane in 2018.

Unsurprisingly, given how much time we spend inside of them, our buildings—both residential and commercial—emit a lot of greenhouse gases. Heating, cooling, cooking, running appliances, and maintaining other building-wide systems accounted for 13 percent of U.S. emissions overall in 2020. And even worse, some 30 percent of the energy used in U.S. buildings goes to waste, on average.

Every day, great strides are being made in energy efficiency , allowing us to achieve the same (or even better) results with less energy expended. By requiring all new buildings to employ the highest efficiency standards—and by retrofitting existing buildings with the most up-to-date technologies—we’ll reduce emissions in this sector while simultaneously making it easier and cheaper for people in all communities to heat, cool, and power their homes: a top goal of the environmental justice movement.

An aerial view of clearcut sections of boreal forest near Dryden in Northwestern Ontario, Canada, in June 2019

River Jordan for NRDC

Another way we’re injecting more greenhouse gas into the atmosphere is through the clearcutting of the world’s forests and the degradation of its wetlands . Vegetation and soil store carbon by keeping it at ground level or underground. Through logging and other forms of development, we’re cutting down or digging up vegetative biomass and releasing all of its stored carbon into the air. In Canada’s boreal forest alone, clearcutting is responsible for releasing more than 25 million metric tons of carbon dioxide into the atmosphere each year—the emissions equivalent of 5.5 million vehicles.

Government policies that emphasize sustainable practices, combined with shifts in consumer behavior , are needed to offset this dynamic and restore the planet’s carbon sinks .

The Yellow Line Metro train crossing over the Potomac River from Washington, DC, to Virginia on June 24, 2022

Sarah Baker

The decisions we make every day as individuals—which products we purchase, how much electricity we consume, how we get around, what we eat (and what we don’t—food waste makes up 4 percent of total U.S. greenhouse gas emissions)—add up to our single, unique carbon footprints . Put all of them together and you end up with humanity’s collective carbon footprint. The first step in reducing it is for us to acknowledge the uneven distribution of climate change’s causes and effects, and for those who bear the greatest responsibility for global greenhouse gas emissions to slash them without bringing further harm to those who are least responsible .

The big, climate-affecting decisions made by utilities, industries, and governments are shaped, in the end, by us : our needs, our demands, our priorities. Winning the fight against climate change will require us to rethink those needs, ramp up those demands , and reset those priorities. Short-term thinking of the sort that enriches corporations must give way to long-term planning that strengthens communities and secures the health and safety of all people. And our definition of climate advocacy must go beyond slogans and move, swiftly, into the realm of collective action—fueled by righteous anger, perhaps, but guided by faith in science and in our ability to change the world for the better.

If our activity has brought us to this dangerous point in human history, breaking old patterns can help us find a way out.

This NRDC.org story is available for online republication by news media outlets or nonprofits under these conditions: The writer(s) must be credited with a byline; you must note prominently that the story was originally published by NRDC.org and link to the original; the story cannot be edited (beyond simple things such as grammar); you can’t resell the story in any form or grant republishing rights to other outlets; you can’t republish our material wholesale or automatically—you need to select stories individually; you can’t republish the photos or graphics on our site without specific permission; you should drop us a note to let us know when you’ve used one of our stories.

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Guest Essay

Xi Thinks China Can Slow Climate Change. What if He’s Right?

By Jacob Dreyer

Mr. Dreyer, an editor and writer who focuses on the Chinese political economy and science, wrote from Shanghai.

At first glance, Xi Jinping seems to have lost the plot.

China’s president appears to be smothering the entrepreneurial dynamism that allowed his country to crawl out of poverty and become the factory of the world. He has brushed aside Deng Xiaoping’s maxim “To get rich is glorious” in favor of centralized planning and Communist-sounding slogans like “ ecological civilization ” and “ new, quality productive forces ,” which have prompted predictions of the end of China’s economic miracle.

But Mr. Xi is, in fact, making a decades-long bet that China can dominate the global transition to green energy, with his one-party state acting as the driving force in a way that free markets cannot or will not. His ultimate goal is not just to address one of humanity’s most urgent problems — climate change — but also to position China as the global savior in the process.

It has already begun. In recent years, the transition away from fossil fuels has become Mr. Xi’s mantra and the common thread in China’s industrial policies. It’s yielding results: China is now the world’s leading manufacturer of climate-friendly technologies, such as solar panels , batteries and electric vehicles . Last year the energy transition was China’s single biggest driver of overall investment and economic growth, making it the first large economy to achieve that.

This raises an important question for the United States and all of humanity: Is Mr. Xi right? Is a state-directed system like China’s better positioned to solve a generational crisis like climate change, or is a decentralized market approach — i.e., the American way — the answer?

How this plays out could have serious implications for American power and influence.

Look at what happened in the early 20th century, when fascism posed a global threat. America entered the fight late, but with its industrial power — the arsenal of democracy — it emerged on top. Whoever unlocks the door inherits the kingdom, and the United States set about building a new architecture of trade and international relations. The era of American dominance began.

Climate change is, similarly, a global problem, one that threatens our species and the world’s biodiversity. Where do Brazil , Pakistan , Indonesia and other large developing nations that are already grappling with the effects of climate change find their solutions? It will be in technologies that offer an affordable path to decarbonization, and so far, it’s China that is providing most of the solar panels , electric cars and more. China’s exports, increasingly led by green technology, are booming, and much of the growth involves exports to developing countries .

From the American neoliberal economic viewpoint, a state-led push like this might seem illegitimate or even unfair. The state, with its subsidies and political directives, is making decisions that are better left to the markets, the thinking goes.

But China’s leaders have their own calculations, which prioritize stability decades from now over shareholder returns today. Chinese history is littered with dynasties that fell because of famines, floods or failures to adapt to new realities. The Chinese Communist Party’s centrally planned system values constant struggle for its own sake, and today’s struggle is against climate change. China received a frightening reminder of this in 2022, when vast areas of the country baked for weeks under a record heat wave that dried up rivers , withered crops and was blamed for several heatstroke deaths.

China’s government knows that it must make this green transition out of rational self-interest or risk joining the Soviet Union on history’s scrap heap, and is actively positioning itself to do so. It is increasingly led by people with backgrounds in science, technology and environmental issues. Shanghai, the country’s largest city and its financial and industrial leading edge, is headed by Chen Jining, an environmental systems expert and China’s former minister of environmental protection. Across the country, money is being poured into developing and bringing to market new advances in things like rechargeable batteries and into creating corporate champions in renewable energy .

To be clear, for Mr. Xi, this green agenda is not purely an environmental endeavor. It also helps him tighten his grip on power. In 2015, for instance, the Central Environmental Inspection Team was formed to investigate whether provincial leaders and even agencies of the central government were adhering to his green push, giving him another tool with which to exert his already considerable power and authority.

At the same time, locking in renewable energy sources is a national security issue for Mr. Xi; unlike the United States, China imports almost all of its oil, which could be disrupted by the U.S. Navy in choke points like the Malacca Strait in the event of war.

Mr. Xi’s plan — call it his Green Leap Forward — has serious deficiencies. China continues to build coal-fired power plants , and its annual greenhouse-gas emissions remain far greater than those of the United States, though American emissions are higher on a per-capita basis. China’s electric vehicle industry was built on subsidies , and the country may be using forced labor to produce solar panels. Those are serious concerns, but they fade into the background when Pakistan floods or Brazil wants to build an E.V. factory or South Africa desperately needs solar panels for a faltering energy grid.

American politics may be inadvertently helping China gobble up global market share in renewable energy products. When the United States — whether for national security or protectionist reasons — keeps Chinese companies like Huawei out of the American market or rolls up the welcome mat for electric vehicle makers like BYD or companies involved in artificial intelligence or self-driving cars, those businesses must look elsewhere.

President Biden’s Inflation Reduction Act , aimed at tackling climate change, has put the United States on a solid path toward carbon neutrality. But America’s decentralization and focus on private innovation means government policy cannot have quite the same impact that it can in China.

So it is crucial for Americans to recognize that, for most of the world, perhaps for all of us, China’s ability to provide low-cost green technology is, on balance, great news. All of humanity needs to move toward renewables at a huge scale — and fast. America still leads in innovation, while China excels in taking frontier science and making its application in the real world cost-effective. If American politicians, investors and businesses recognize that climate change is humanity’s biggest threat, that could open pathways for diplomacy, collaboration and constructive competition with China that benefit us all.

Together, China and the United States could decarbonize the world. But if Americans don’t get serious about it, the Chinese will do it without them.

And if the United States tries to obstruct China, by way of corporate blacklists, trade or technology bans or diplomatic pressure, it will end up looking like part of the climate problem. That happened earlier this month when Treasury Secretary Janet Yellen, during a visit to China, urged officials here to rein in green technology exports that the United States says are hurting American companies.

Mr. Xi won’t completely toss out the polluting manufacturing-for-export economic model that has served China so well, nor does he seem ready to halt construction of coal plants. Both are considered necessary for economic and energy security until the green transition is complete. But they are now only a means to an end. The endgame, it seems, is to reach carbon neutrality while dominating the industries making that possible.

Much like how the United States showed up late for World War II, China’s clean-tech companies are latecomers, piggybacking on technology developed elsewhere. But history rewards not necessarily who was there first but who was there last — when a problem was solved. Mr. Xi seems to discern the climate chaos on the horizon. Winning the race for solutions means winning the world that comes next.

Jacob Dreyer is an American editor and writer focused on the intersection of the Chinese political economy and science. He lives in Shanghai.

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Turmoil at NPR after editor rips network for political bias

The public radio network is being targeted by conservative activists over the editor’s essay, which many staffers say is misleading and inaccurate.

Uri Berliner had worked at NPR for a quarter-century when he wrote the essay that would abruptly end his tenure. On April 9, the Free Press published 3,500 words from Berliner, a senior business editor, about how the public radio network is guilty of journalistic malpractice — for conforming to a politically liberal worldview at the expense of fairness and accuracy.

“It’s true NPR has always had a liberal bent, but during most of my tenure here, an open-minded, curious culture prevailed,” Berliner wrote. “We were nerdy, but not knee-jerk, activist, or scolding. In recent years, however, that has changed.”

The essay, whose arguments were disputed by NPR management and many staffers, plunged the network into a week-long public controversy.

Last week NPR’s new CEO, Katherine Maher, indirectly referenced Berliner’s essay in a note to staff that NPR also published online. “Asking a question about whether we’re living up to our mission should always be fair game: after all, journalism is nothing if not hard questions,” she wrote. “Questioning whether our people are serving our mission with integrity, based on little more than the recognition of their identity, is profoundly disrespectful, hurtful, and demeaning.”

The drama reached a pinnacle Wednesday, when Berliner resigned while taking a shot at Maher.

In his resignation letter, Berliner called NPR “a great American institution” that should not be defunded. “I respect the integrity of my colleagues and wish for NPR to thrive and do important journalism,” he wrote in the letter, posted on his X account. “But I cannot work in a newsroom where I am disparaged by a new CEO whose divisive views confirm the very problems I cite in my Free Press essay.”

Berliner’s comments have angered many of his now-former colleagues, who dismissed as inaccurate his depiction of their workplace and who say his faulty criticisms have been weaponized against them.

Berliner’s essay is titled “ I’ve Been at NPR for 25 Years. Here’s How We Lost America’s Trust .” On its face, it seemed to confirm the worst suspicions held by NPR’s critics on the right: that the legendary media organization had an ideological, progressive agenda that dictates its journalism. The Free Press is an online publication started by journalist Bari Weiss, whose own resignation from the New York Times in 2020 was used by conservative politicians as evidence that the Times stifled certain ideas and ideologies; Weiss accused the Times of catering to a rigid, politically left-leaning worldview and of refusing to defend her against online “bullies” when she expressed views to the contrary. Berliner’s essay was accompanied by several glossy portraits and a nearly hour-long podcast interview with Weiss. He also went on NewsNation, where the host Chris Cuomo — who had been cast out from CNN for crossing ethical lines to help his governor-brother — called Berliner a “whistleblower.”

Initially, Berliner was suspended for not getting approval for doing work for another publication. NPR policy requires receiving written permission from supervisors “for all outside freelance and journalistic work,” according to the employee handbook.

An NPR spokeswoman said Wednesday that the network does not comment on personnel matters. Berliner declined The Washington Post’s request for further comment.

In an interview Tuesday with NPR’s David Folkenflik — whose work is also criticized in the Free Press essay — Berliner said “we have great journalists here. If they shed their opinions and did the great journalism they’re capable of, this would be a much more interesting and fulfilling organization for our listeners.”

Berliner’s future at NPR became an open question. NPR leaders were pressed by staff in meetings this week as to why he was still employed there. And some reporters made clear they didn’t want to be edited by Berliner anymore because they now questioned his journalistic judgment, said one prominent NPR journalist, who spoke on the condition of anonymity to preserve relationships. “How are you supposed to have honest debates about coverage if you think it’s going to be fodder for the point he’s trying to make?” the staffer said.

Berliner had written that “there’s an unspoken consensus” about stories to pursue at NPR — “of supposed racism, transphobia, signs of the climate apocalypse, Israel doing something bad, and the dire threat of Republican policies” — and that the network operated without friction, “almost like an assembly line.”

Several prominent NPR journalists countered that impression. “We have strong, heated editorial debates every day to try and get the most appropriate language and nuanced reporting in a landscape that is divisive and difficult to work in as a journalist,” Leila Fadel, host of “Morning Edition,” told The Post. “Media and free independent press are often under attack for the fact-based reporting that we do.” She called Berliner’s essay “a bad-faith effort” and a “factually inaccurate take on our work that was filled with omissions to back his arguments.”

Other staffers noted that Berliner did not seek comment from NPR for his piece. No news organization is above reproach, “Weekend Edition” host Ayesha Rascoe told The Post, but someone should not “be able to tear down an entire organization’s work without any sort of response or context provided, or pushback.” There are many legitimate critiques to make of NPR’s coverage, she added, “but the way this has been done — it’s to invalidate all the work NPR does.”

NPR is known to have a very collegial culture, and the manner in which Berliner aired his criticism — perhaps even more than the substance of it — is what upset so many of his co-workers, according to one staffer.

“Morning Edition” host Steve Inskeep, writing on his Substack on Tuesday , fact-checked or contextualized several of the arguments Berliner made. For instance: Berliner wrote that he once asked “why we keep using that word that many Hispanics hate — Latinx.” Inskeep said he searched 90 days of NPR’s content and found “Latinx” was used nine times — “usually by a guest” — compared to the nearly 400 times “Latina” and “Latino” were used.

“This article needed a better editor,” Inskeep wrote. “I don’t know who, if anyone, edited Uri’s story, but they let him publish an article that discredited itself. … A careful read of the article shows many sweeping statements for which the writer is unable to offer evidence.”

This week conservative activist Christopher Rufo — who rose to fame for targeting “critical race theory,” and whose scrutiny of Harvard President Claudine Gay preceded her resignation — set his sights on Maher, surfacing old social media posts she wrote before she joined the news organization. In one 2020 tweet, she referred to Trump as a “deranged racist.” Others posts show her wearing a Biden hat, or wistfully daydreaming about hanging out with Kamala D. Harris. Rufo has called for Maher’s resignation.

“In America everyone is entitled to free speech as a private citizen,” Maher wrote in a statement to The Post, when asked about the social media posts. “What matters is NPR’s work and my commitment as its CEO: public service, editorial independence, and the mission to serve all of the American public.”

Maher, who started her job as NPR CEO last month, previously was the head of the Wikimedia Foundation, the nonprofit that operates the online encyclopedia Wikipedia. An NPR spokesperson said in a statement Tuesday that Maher “was not working in journalism at the time” of the social media posts; she was “exercising her first amendment right to express herself like any other American citizen,” and “the CEO is not involved in editorial decisions.”

In a statement, an NPR spokesperson described the outcry over Maher’s old posts as “a bad faith attack that follows an established playbook, as online actors with explicit agendas work to discredit independent news organizations.”

Meanwhile, some NPR staffers want a more forceful defense of NPR journalism by management. An internal letter — signed by about 50 NPR staffers as of Wednesday afternoon — called on Maher and NPR editor in chief Edith Chapin to “publicly and directly” call out Berliner’s “factual inaccuracies and elisions.”

In the essay, Berliner accuses NPR of mishandling three major stories: the allegations of the 2016 Trump campaign’s collusion with Russia, the origins of the coronavirus , and the authenticity and relevance of Hunter Biden’s laptop. Berliner’s critics note that he didn’t oversee coverage of these stories. They also say that his essay indirectly maligns employee affinity groups — he name-checks groups for Muslim, Jewish, queer and Black employees, which he wrote “reflect broader movement in the culture of people clustering together based on ideology or a characteristic at birth.” (Berliner belonged to the group for Jewish employees, according to an NPR staffer with knowledge of membership.) He also writes that he found NPR’s D.C. newsroom employed 87 registered Democrats and zero Republicans in editorial positions in 2021. His critics say this figure lacks proper context.

Tony Cavin, NPR’s managing editor of standards and practices, told The Post that “I have no idea where he got that number,” that NPR’s newsroom has 660 employees, and that “I know a number of our hosts and staff are registered as independents.” That includes Inskeep, who, on his Substack, backed up Cavin’s assessment.

Berliner also wrote that, during the administration of Donald Trump , NPR “hitched our wagon” to top Trump antagonist Rep. Adam Schiff (D-Calif.) by interviewing him 25 times about Trump and Russia. Cavin told The Post NPR aired 900 interviews with lawmakers during the same period of time, “so that’s 3 percent. He’s a business reporter, he knows about statistics and it seems he’s selectively using statistics.”

Cavin said some inside the organization agree with points Berliner made, even if they “don’t like the way he went about it. The irony of this is it tells you how diverse as an organization we are, in ideological terms.”

“There are a few bits of truth in this,” NPR international correspondent Eyder Peralta wrote on Facebook. But he said the essay “uses a selecting reading to serve the author’s own world views” and paints with “too broad a brush.”

“I have covered wars, I have been thrown in jail for my work,” Peralta told The Post, “and for him to question part of what is in our nature, which is intellectual curiosity and that we follow our noses where they lead us, that hurts. And I think that damages NPR.”

Some staffers have also been attacked online since the essay’s publication. Rascoe, who, as a Black woman host for NPR, says she’s no stranger to online vitriol, but one message after Berliner’s essay labeled her as a “DEI hire” who has “never read a book in her life.”

“What stung about this one was it came on the basis of a supposed colleague’s op-ed,” whose words were “being used as fodder to attack me,” Rascoe said. “And my concern is not about me, but all the younger journalists who don’t have the platform I have and who will be attacked and their integrity questioned simply on the basis of who they are.”

NPR, like much of the media industry, has struggled in recent years with a declining audience and a tough ad market. NPR laid off 100 workers in 2023, one of its largest layoffs ever , citing fewer sponsorships and a projected $30 million decline in revenue.

Going forward, some staffers worry about the ramifications of Berliner’s essay and the reactions to it. The open letter to Maher and Chapin said that “sending the message that a public essay is the easiest way to make change is setting a bad precedent, regardless of the ideologies being expressed.”

An earlier version of this article included a reference to Uri Berliner's Free Press essay in which Berliner cited voter registration data for editorial employees of NPR's D.C. newsroom. The article has been updated to clarify that this data was from 2021, not the present day.

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