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  1. Climate change - Wikipedia

    Present-day climate change includes both global warming —the ongoing increase in global average temperature —and its wider effects on Earth's climate system. Climate change in a broader sense …

  2. Global warming | Definition, Causes, Effects, Solutions, & Facts ...

    Nov 24, 2025 · Modern global warming is the result of an increase in magnitude of the so-called greenhouse effect, a warming of Earth’s surface and lower atmosphere caused by the presence of …

  3. What Is Global Warming? - National Geographic

    Climate change has accelerated the rate of ice loss across the continent. The "greenhouse effect" is the warming that happens when certain gases in Earth's atmosphere trap heat. These gases let...

  4. Global Warming - NASA Science

    Jun 3, 2010 · Global warming is the unusually rapid increase in Earth’s average surface temperature over the past century primarily due to the greenhouse gases released as people burn fossil fuels.

  5. Climate change impacts - National Oceanic and Atmospheric Administration

    Nov 18, 2025 · We often think about human-induced climate change as something that will happen in the future, but it is happening now. Ecosystems and people in the United States and around the …

  6. Basics of Climate Change - US EPA

    Dec 5, 2025 · The earth's climate is changing. Multiple lines of evidence show changes in our weather, oceans, ecosystems, and more. The buildup of greenhouse gases in our atmosphere and the …

  7. New data raises questions about how much the Earth has warmed

    Dec 15, 2025 · The severity of global warming has long depended on your frame of reference — on what temperature you think was normal for the Earth before humans began changing it.

  8. Global Warming - National Geographic Society

    Apr 8, 2025 · Global warming refers to Earth’s rising average temperature, while climate change refers to changes in weather patterns and growing seasons around the world. Global warming causes …

  9. Global Warming 101 - Definition, Facts, Causes and Effects of ... - NRDC

    Jul 6, 2023 · Global warming results from the increasing concentration of carbon dioxide (CO2) and other greenhouse gases that trap heat in the earth’s atmosphere. This trapped energy comes from …

  10. Climate Change 101

    Human actions, such as burning fossil fuels and deforestation, are rapidly driving global warming and changing the climate. Global temperatures have increased significantly since pre-industrial times, …