A new study warns that if nothing is done to curb carbon emissions, sea levels could rise by more than six feet by the end of the century, flooding major cities — including Shanghai, Miami, and Mumbai – and displacing about 200 million people. As the Earth gets warmer, ice sheets are melting faster than previously predicted, the study's scientists said. Co-author Robert Kopp, director of the Institute of Earth, Ocean, and Atmospheric Studies at Rutgers University, told NBC News there are many uncertainties when it comes to the ice sheets in Greenland and Antarctica. The worst case scenario would be a temperature increase of 9 degrees Fahrenheit by 2100, which is "consistent with unchecked emissions growth," Kopp said. Scientists said this would lead to sea levels rising by more than six feet and the permanent flooding of 700,000 square miles of land.

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