Photo: Global Warming "Tipping Points" Reached, Scientist Says

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A NASA simulation shows areas that would be flooded (red) by a rise in sea levels of one meter (about three feet).

A prominent climatologist has said that Earth has already reached many "tipping points"—including the melting of large amounts of ice—and an immediate curb on fossil-fuel use is needed or humans risk reaching a "point of no return."

Image courtesy NASA

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