The polar bear has long been a symbol of the damage wrought by global warming, but now biologist Andrew Derocher and his colleagues have calculated how long one southerly population can hold out. Their answer? No more than a few decades, as the bears’ decline closely tracks that of the Arctic’s disappearing sea ice. Read more

 

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An underweight adult female with two 10-month-old cubs waiting for the ice to re-form on Hudson Bay in November. The female is wearing a GPS collar that allows scientists to monitor cub survival, movements, habitat use, and responses to sea ice formation and melt. (Photo courtesy of Andrew E. Derocher)

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