Sea levels along the world’s coastlines are much higher than previously assumed, more than 3 feet in some regions, according to new research, raising alarms that the world is underestimating the extent of the threat and how quickly coastlines could disappear.

Sea levels along the world’s coastlines are much higher than previously assumed, more than 3 feet in some regions, according to new research, raising alarms that the world is underestimating the extent of the threat and how quickly coastlines could disappear.