Polar bears are seen within the 1002 Area of the Arctic National Wildlife Refuge

Polar bears are seen within the 1002 Area of the Arctic National Wildlife Refuge

A polar bear sow and two cubs are seen on the Beaufort Sea coast within the 1002 Area of the Arctic National Wildlife Refuge in this undated handout photo provided by the U.S. Fish and Wildlife Service Alaska Image Library on December 21, 2005. Courtesy U.S. Fish and Wildlife Service/Handout via REUTERS ATTENTION EDITORS - THIS IMAGE WAS PROVIDED BY A THIRD PARTY. EDITORIAL USE ONLY

December 20, 2016 5:29 PM (UTC+8)