Global Warming Threatens Penguins

Frozen? With their food source under threat and their habitat evaporating, Emperor, Adelie, King, Chinstrap and Gentoo Penguins
Frans Lanting / Corbis

Frozen?
With their food source under threat and their habitat evaporating, Emperor, Adelie, King, Chinstrap and Gentoo Penguins all share Antarctica's uncertain future.

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