A polar bear wearing a GPS video-camera collar lies on a chunk of sea ice in the Beaufort Sea in 2015. A new study released Thursday shows some polar bears are losing weight during the time they are supposed to be gaining. (Anthony Pagano / USGS file)

A polar bear wearing a GPS video-camera collar lies on a chunk of sea ice in the Beaufort Sea in 2015. A new study released Thursday shows some polar bears are losing weight during the time they are supposed to be gaining. (Anthony Pagano / USGS file)

As Arctic sea ice thins, so do polar bears

Scientists say global warming is to blame.

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