Jul 222013
A study published in Nature Geoscience by researchers, from Imperial College London and their academic partners shows that 5-3 million years ago in the Pliocene, the last time it was as hot as it is going to be in this century, antarctic ice shelf melting caused a sea level rise of as much as 20 meters (65 feet).
At 65 feet sea level rise, we basically lose Louisiana and most of Florida, according to this useful intractive map:
Scary.