Regions at greatest risk for species extinction the least studied

Scientists have crunched the numbers and the results are clear. For every degree that global temperatures rise, more species will become extinct. Overall, the study predicts a nearly 3 percent species extinction rate based on current conditions. If the earth warms another 3°C, the extinction risk rises to 8.5 percent. And if climate change continues on that trajectory, the world would experience a 4.3°C rise in temperature by the year 2100 -- meaning a 16 percent extinction rate.

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