Normally, solar energy strikes the Earth's surface and bounces back into space. To prevent the Earth from cooling too much, a thin layer of gases traps some of the radiant heat close to the Earth, similar to what occurs in a greenhouse. These gases, referred to as "greenhouse gases," are necessary for the Earth to retain enough heat to support life. Today, concentrations of greenhouse gases are higher than ever, resulting not only in warmer temperatures, but other harmful effects as well.
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