While experts orignially thought in 2013 that sea-level would rise by about three feet by 2100 due to green house gas emissions, a new study from Nature predicts that it could rise twice as much. Co.Exist staffer Adele Peters takes a look at this acceleration which may be caused by Antarctica melting and falling apart.

The new model takes into account water running into the cracks of the ice shelf as it melts and breaking it apart as well as ice cliffs losing their standing support due to the disappearance of floating ice. Water retreating inward will have a potential impact on all coastal cities:

Every coastal city is at risk. "If it really happens—which hopefully it won't, and we'll avoid these business-as-usual scenarios—if 15 meters of sea level rise, average over the world, happens, there's not one place where it would just stay zero," says Pollard. "There would be drastic rises everywhere."

Just for the record, the U.S. EPA projects a sea level rise of 1 to 4 feet by 2100.

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