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stances near the Beaufort Sea in which polar bears ate one another.
The Interior official said government officials studying Alaskan polar bears in the southern Beaufort Sea area have observed thinner adult bears and a lower rate of survival among cubs. Although the population has yet to dip, "unless the polar cub survival rate goes up, it would have to happen," the official said.
Still, the official added that the decision to propose polar bears as threatened with extinction "wasn't easy for us" because "there is still some significant uncertainty" about what could happen to bear populations in the future.
"This proposal is sort of like a scientific hypothesis. You put this out there and say to the world, 'Tell us, is this right or is this wrong?' " the official said, adding that Interior will hold several public hearings about its proposal. "We're projecting what we think will happen in the future, not just what's happening at this moment."
The department could take up to a year to complete its proposal, and it could abandon the listing if it unearths new scientific projections about the bears' fate. But that appears unlikely, as recent models have consistently pointed to a faster deterioration of Arctic sea ice.
Although federal officials cited rising sea temperatures once before in a threatened-species proposal -- in May, when they called them a "major stressor" on Caribbean elkhorn and staghorn corals -- today's proposal will mark the first time the administration has identified climate change as the driving force behind the potential demise of a species.
Robert Correll, the scientist who chaired the international Arctic Climate Impact Assessment in 2004, said in an interview that the proposal to place polar bears on the endangered species list is "highly justified."
Correll, now directs the global change program at the H. John Heinz III Center for Science, Economics and the Environment, added that he is participating in an administration-funded study at the Center for Strategic and International Studies on how climate change could affect national security and foreign policy.
That, along with the proposal on polar bears, he said, "plays into a reality that, in my opinion, they're going to be rethinking their position" on global warming.
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