Collapse of Antarctic ice sheet is underway and unstoppable but will take centuries

Darryl Fears of the Washington Post cites two new studies suggesting sea-level rise will be higher and potentially more devastating than earlier projections have noted. A University of Washington study and another authored by Eric Rignot, a professor of Earth science at the University of California at Irvine who was commissioned by NASA, both suggested that the melting is unstoppable and will take place over 200 - 1,000 years and dump several feet of new water into the oceans.

Fears goes on to note that scientists in the recently published National Climate Assessment predict harsh scenarios for coastal regions which can expect to see substantial flooding and loss of wetlands and other natural areas that offer storm protection as sea-levels rise. 

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