Arctic Warming and Polar Bears (IMAGE) University of Chicago Caption University of Chicago climate scientist Pamela Martin and 30 of her colleagues across North America and Europe are urging the U.S. fish and Wildlife Service to list the polar bear as a threatened species because global warming is melting its sea-ice habitat. Credit Photo by Lloyd DeGrane Usage Restrictions This image may be used by news organizations in connection with reports related to this announcement. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.