Revkin posts a video of an enormous walrus herd, then claims they're "having a tough time"

YouTube - Walruses and Arctic Warming

Walruses have been having a tough time as sea ice in the Arctic has increasingly retreated from coasts in summer, when the mammals use it as a nursery while they feed in shallow waters.

Andy: Where's your evidence that walruses are "having a tougher time" now than they did 10, 20, 50, 100, 1000, or 10,000 years ago?

On Walruses and Warming - Dot Earth Blog - NYTimes.com

The giant clam-digging marine mammal, greatly recovered from enormous hunting pressure, appears to be facing rising climate-related stresses