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The greenhouse effect is

a. something that has occurred for millions of years.
b. an unnatural phenomenon caused by humans that maintains earth���s temperature range.
c. the result of the differences in the angle of the sun���s rays.
d. an unnatural phenomenon that causes heat energy to be radiated back into the atmosphere.

User Marsia
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d. an unnatural phenomenon that causes heat energy to be radiated back into the atmosphere.
User Len Jaffe
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