Climate change has really messed up polar bears’ lives

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By Louise C. Archer et al, Science. 

Summary: ...polar bear populations have declined over the past 50 years as the extent of sea ice has decreased. Archer et al. used data collected from polar bears in the western Hudson Bay Area over nearly all of that time.... Energetic patterns at the individual level successfully predicted larger-scale population dynamics. A single driver, energy limitation, emerged as being responsible for the population decline, confirming that polar bears face food shortages due to the loss of ice. —Sacha Vignieri.... 

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