Global warming may already be a killer

12:41pm, February 14, 2006

Earth's rising temperatures may be a precipitating factor in the extinctions of dozens of tropical frog species, according to new research.

At least 110 species of harlequin frogs once lived in Central and South America, but two-thirds of them went extinct in the past 2 decades. Scientists have puzzled over these and other amphibian disappearances in seemingly pristine areas.

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