Associated Press: Federal marine mammal experts in Alaska studying the effects of global warming on walrus, polar bears and ice seals warn there are limit to the protections they can provide. They can restrict hunters, ship traffic and offshore petroleum activity, but that may not be enough if the animals’ basic habitat – sea ice – disappears every summer. "Ultimately it’s beyond my scope," said Joel Garlich-Miller, a walrus expert for the U.S. Fish and Wildlife Service in Anchorage. …