Solar energy (energy from the sun) is vital to the existence of planet Earth. It
passes through the atmosphere to Earth's surface. This is not a problem, provided
that Earth sends some of this solar energy back into space. This process is called
radiation. However, in recent years, partly because of pollution, Earth has not
radiated enough of the solar energy back into space. Some of the solar energy
reflects back onto Earth's surface, making Earth warmer than it should be. This
process is called the greenhouse effect, and the result is global warming - planet
Earth is now hotter than it should be.
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