New Scientist: Parts of the West Antarctic Ice Sheet are already collapsing and probably can't be saved. Two independent studies suggest that several glaciers have gone past the point of no return, dooming them to fall into the sea and cause several metres of sea level rise. However the collapse will take centuries.
"A large sector of the West Antarctic Ice Sheet has gone into irreversible retreat," says Eric Rignot of the University of California at Irvine, who led one of the studies. "We've gone beyond the...