Climate changes - Global warming 101
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What has happened to the Earth's climate for 2.5 million years?
IT HAS fluctuated, cycling from ice ages to warmer periods.
What do scientists believe?
THEY BELIEVE that IT IS HUMAN ACTIVITY that is driving the temperatures up.
What happens to the energy the sun radiates to the Earth?
THE EARTH and THE ATMOSPHERE absorb some of this energy while the rest is radiated back into the space.
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