"Stranded polar bears are drowning in large numbers as they try to swim hundreds of miles to find increasingly scarce ice floes. Local hunters find their corpses floating on seas once coated in a thick skin of ice.
It is a phenomenon that frightens the native people that live around the Arctic. Many fear their children will never know the polar bear. "The ice is moving further and further north," said Charlie Johnson, 64, an Alaskan Nupiak from Nome, in the state's far west. "In the Bering Sea the ice leaves earlier and earlier. On the north slope, the ice is retreating as far as 300 or 400 miles offshore."
Last year, hunters found half a dozen bears that had drowned about 200 miles north of Barrow, on Alaska's northern coast. "It seems they had tried to swim for shore ... A polar bear might be able to swim 100 miles but not 400."
http://www.coastalpost.com/05/11/01.html