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Temperature patterns during Earth's last prolonged global "hot spell"--the Pliocene, some 5.3 to 2.6 million years ago--differed dramatically from those of modern times according to a new study. The researchers say cloud feedbacks, ocean mixing and other factors must have played a greater role in Pliocene warming than previously recognized, and these must be accounted for to make meaningful predictions of Earth's future climate. [Source: National Science Foundation]
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