sea level

Last week, scientists warned that a massive chunk of the West Antarctica Ice Sheet will eventually drift into the sea and melt, raising sea levels at least 10 feet higher than previous predictions.

Even before the announcement, scientists at the nonprofit research organization Climate Central predicted that surging seas could put the homes of nearly 5 million Americans underwater by the end of this century.

Florida — especially South Florida — is very flat and very low, and in places like Miami Beach and Key West, buildings are just 3 feet above sea level. Scientists now say there may be a 3-foot rise in the world's oceans by the end of the century.