Polar bear population seen declining (AP)

This is an undated handout photo of a polar bear taken in the Arctic National Wildlife Refuge.  More than two-thirds of the world's polar bears will be killed off by 2050 - the species completely gone from Alaska - because of thinning sea ice from global warming in the Arctic, government scientists forecast Friday.    (AP Photo/Subhankar Banerjee, File)AP - Two-thirds of the world's polar bears will be killed off by 2050 — and the entire population gone from Alaska — because of thinning sea ice from global warming in the Arctic, government scientists forecast Friday.