A polar bear keeps close to her young along the Beaufort Sea coast in Arctic National Wildlife Refuge, Alaska in a March 6, 2007 file photo. Oil from a spill or oil well blowout in the Arctic waters ... more 

A polar bear keeps close to her young along the Beaufort Sea coast in Arctic National Wildlife Refuge, Alaska in a March 6, 2007 file photo. Oil from a spill or oil well blowout in the Arctic waters of Canada's Beaufort Sea could easily become trapped in sea ice and potentially spread more than 1,000 kilometers to the west coast of Alaska, a World Wildlife Fund study showed on July 25, 2014. REUTERS/Susanne Miller/USFWS/handout (UNITED STATES - Tags: ENERGY ENVIRONMENT ANIMALS DISASTER) FOR EDITORIAL USE ONLY. NOT FOR SALE FOR MARKETING OR ADVERTISING CAMPAIGNS. THIS IMAGE HAS BEEN SUPPLIED BY A THIRD PARTY. IT IS DISTRIBUTED, EXACTLY AS RECEIVED BY REUTERS, AS A SERVICE TO CLIENTS less