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Published on 06 Jan 2012 | over 5 years ago

The temperature of earth has been relatively constant over time. This is possible because as the planet absorbs solar radiation, it also emits longwave radiation into space. Despite this radiative equilibrium, some longwave radiation remains trapped beneath the atmosphere of the earth and warms the surface of the earth. This phenomenon is called the "greenhouse effect."

Read more about Global Warming here earthobservatory.nasa.gov/Features/GlobalWarming/
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