polar bears polar bears some polar bear populations appear to be unaffected source ActionBioscience: Polar Bears and Climate Change ActionBioscience: Polar Bears and Climate Change "Polar Bears and Climate Change," some polar bear populations appear to be unaffected http://www.actionbioscience.org/environment/derocher.html "Polar Bears and Climate Change," ActionBioscience: Polar Bears and Climate Change http://actionbioscience.org/