Answer:
Global warming is the long-term heating of Earth's climate system caused by the increasing levels of greenhouse gases in the atmosphere.
Explanation:
Greenhouse gases are gases that absorb and trap heat, and they include water vapor, carbon dioxide, methane, and nitrous oxide. The increased levels of these gases are mainly the result of human activities, such as burning fossil fuels and deforestation. Global warming is causing the Earth's average temperature to rise, which is leading to a variety of environmental changes, including melting ice, rising sea levels, and more frequent extreme weather events.
