The Center for Biological Diversity awarded Alaska Governor Sarah Palin the 2008 Rubber Dodo Award . Governor Palin won the award for fighting the Department of Interior 's designation of the polar bear as a threatened species . The polar bear is threatened by a shrinking habitat due to global warming .
According to the above context, choose the best option to answer the following question.
Question: How has global warming affected Polar bear habitats ?
Options:
A. El nino is a weather pattern caused by global warming that directly affects polar bears .
B. Global warming has affected weather patterns that cause severe storms in the southern hemisphere .
C. None of the above choices .
D. The melting of the ice caps has reduced the cold areas that polars require .


D