"Two studies published this week conclude that a section of the West Antarctic ice sheet has reached a point of inevitable collapse, an event that would eventually raise sea levels more than a meter (three-plus feet). The first study, led by Eric Rignot of the Jet Propulsion Laboratory, used NASA satellite and airborne observations to measure how glaciers have been retreating in the region. The other study, led by Ian Joughin of the University of Washington, used a computer model to compare observations of recent melting with projected melt scenarios to see which matches reality best so far. Both studies conclude that the Amundsen Sea segment of the ice sheet has begun an irreversible decline that will result in its loss, possibly as soon as the next few hundred years. ..."
http://earthobservatory.nasa.gov/IOTD/view.php?id=83672&src=fb
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