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, , 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 causing greenhouse gases.
![The Earth is feeling the heat.](/sites/un2.un.org/files/2021/08/feeling-the-heat.jpg)
Humans are responsible for global warming
Climate scientists have showed that 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.
than it was in the late 1800s (before the industrial revolution) and warmer than at any time in the last 100,000 years. The , 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 now include, among others, intense droughts, water scarcity, severe fires, rising sea levels, flooding, melting polar ice, catastrophic storms and declining biodiversity.
![The Earth is asking for help.](/sites/un2.un.org/files/2021/08/earth-asking-for-help.jpg)
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 , thousands of scientists and government reviewers agreed that limiting global temperature rise to no more than 1.5°颁 would help us avoid the worst climate impacts and maintain a livable climate. Yet policies currently in place point to a by the end of the century.
The emissions that cause climate change come from every part of the world and affect everyone, but.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.
![Photocomposition: an image of the world globe looking worried to a thermometer with raising temperatures](/sites/un2.un.org/files/2021/09/climatechange11.jpg)
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 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, to keep warming below 1.5°颁. Achieving this means huge declines in the use of coal, oil and gas: over two-thirds of today’s proven reserves of by 2050 in order to prevent catastrophic levels of climate change.
![Growing coalition](/sites/un2.un.org/files/2021/08/climatechange10.jpg)
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.
![Climate finance](/sites/un2.un.org/files/2021/08/financial-investment.jpg)
To get familiar with some of the more technical terms used in connection with climate change, consult the .
Learn more about…
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The facts on climate and energy
Climate change is a hot topic – with myths and falsehoods circulating widely. Find some essential facts here.
![Photocomposition: an image showing causes and effects of climate change - a smokestack and a storm](/sites/un2.un.org/files/causeseffects-nologo.jpg)
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.
![Net zero](/sites/un2.un.org/files/2021/10/image011.png)
Net zero
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.
![Sustainable Development Goals](/sites/un2.un.org/files/blurb-green-planet.jpg)
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.
![Finance](/sites/un2.un.org/files/climate-finance-report-cover.jpg)
Finance
How will the world foot the bill? We explain the issues and the value of financing climate action.
![Adaptation](/sites/un2.un.org/files/2021/09/tw_adaptation_cover10.png)
Adaptation
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.