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Global Warming


Definition
The slow warming of Earth's atmosphere due to climatic change.
 
Key Context
During the day solar radiation heats Earth’s surface. Heat energy from Earth’s surface then radiates outward toward space. Some of the gases in Earth’s atmosphere trap this heat energy. These gases are called greenhouse gases. The theory of global warming states that the increase in atmospheric greenhouse gas concentration as a result of human activity is the cause of Earth’s warming climate.