Antarctic melting
According to a recent study published in Geophysical Research Letters, the discharge rate of three important glaciers still remaining on the peninsula accelerated eightfold just from 2000 to 2003. "Ice is thinning at the rate of tens of meters per year" on the peninsula, with glacier elevations in some places having dropped by as much as 124 feet in six months, the study found.
NYTimes
By LARRY ROHTER Published: January 25, 2005
On a geological time scale, this is incredibly sudden. The article points out that the changes mentioned in this paragraph are in an area that won't have much of an effect on ocean levels becuase it's limited geographically. But similar though less visually obvious changes are occurring in other parts of Antarctica that will have significant effects.
Guess we need to study it all some more, eh?