"Shrinking Sea Ice Could Put Polar Bears In Grave Peril By 2100"

"A new study looks at the future of the Canadian Arctic Archipelago and finds that by the end of this century, the region might be ice-free for 2 to 5 months, something that puts bears in grave peril."

Nell Greenfieldboyce reports for NPR's All Things Considered November 26, 2014.