From Today's New York Times

Animal Ethics

7, 2008 The writer is director of the Center for Health and the Global Environment , Harvard Medical School. Though hunting still plays a role and led to a bilateral treaty with Russia, ratified last September, climate change is the major threat to polar bears today. To the Editor: Re “ Bearing Up ” (Op-Ed, Jan. 5): In contrast to the arguments made by Gov. Sarah Palin of Alaska, the scientific literature is very clear that polar bear survival is highly threatened in the wild.