Until recently, scientists predicted that the global sea level could rise almost three feet by the end of this century if greenhouse gas emissions continue unabated. New research suggests faster-than-expected Antarctic melting under this scenario, threatening a rise of nearly six feet — and many feet more after 2100.
But making deep cuts in global emissions could still keep sea level rise below two feet in this century. This is the difference between a difficult but manageable problem and worldwide catastrophe, affecting land where hundreds of millions live today. In the United States, the greatest threat is to South Florida, home to Mr. Trump’s Mar-a-Lago estate (outlined in red).