CBS News (Video) on MSN7h
Polar bears increasingly under threat as glaciers melt faster than everA new global assessment shows that the world's glaciers are melting faster in the last 10 years compared to the previous decade. Polar bears, which depend on the frozen sheets, are increasingly under ...
After a summer of fasting on land, the bears need to get back to their frozen home to hunt seals and bulk up. But their migration ritual is changing.
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