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In climate change, dire signs of a die-off

By Carl Zimmer | New York Times | Updated: 2011-04-17 07:48

In climate change, dire signs of a die-off

The number of species facing extinction may be underestimated. Deprived of seal, a polar bear raided a goose nest. Jouke Prop

In climate change, dire signs of a die-off

Over the past 540 million years, Earth has seen five great mass extinctions. In each of those catastrophes, an estimated 75 percent or more of all species disappeared in a few million years or less.

In climate change, dire signs of a die-off

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