The feds don't need no stinking data?: If the number of Pacific walruses has doubled since the 1950s, why should we believe that CO2 might kill them all?

Pacific Walrus Faces Dire Future: Federal Report Predicts Extinction Risk Due to Global Warming

ANCHORAGE, Alaska— A new federal report today finds there’s a 40-percent chance that the Pacific walrus, a species imperiled by loss of sea ice due to global warming, will be on a pathway to extinction by the end of the century. Scientists with the Center for Biological Diversity say even that estimate is far too optimistic because the U.S. Geological Survey relied on modeling that underestimates the effects of climate change.

October '09: Global Warming Could Reverse a Walrus Comeback - NYTimes.com

For the moment, the Pacific walrus remains abundant, numbering at least 200,000 by some accounts, double the number in the 1950s.