Greenhouse gases in the Earth's atmosphere trap heat that is released from the Earth.
The sun emits radiation in the form of heat and light.
The atmosphere stops some of the radition from the sun from reaching the Earth.
Some radiation from the sun reaches the surface of the Earth.
Some of the radiation that reachers the surface of the Earth is reflected, it bounces off of the surface of the Earth.
Greenhouse gases in the atmosphere trap the radiation that is reflected off of the surface of the Earth.
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What is Global Warming?
What is Climate Change?