No Escape: Thaw Gains Momentum

Many scientists say it has taken a long time for them to accept that global warming, partly the result of carbon dioxide and other heat-trapping gases in the atmosphere, could shrink the Arctic’s summer cloak of ice.

But many of those same scientists have concluded that the momentum behind human-caused warming, combined with the region’s tendency to amplify change, has put the familiar Arctic past the point of no return.

..David Barber, an Arctic expert at the University of Manitoba, said emissions needed to be cut quickly to avert even greater damage. Skeptics who use the uncertainties to justify delaying such actions forget that uncertainty cuts both ways, and things could be far worse than forecast, Dr. Barber and others say.

NY Times through Climate Ark