Yale Environment 360: By 2030, residents of Washington, D.C., and Annapolis, Maryland, could be experiencing more than 150 tidal floods every year -- up from an average of just 50 today -- according to a recent study of sea level rise and coastal flood risk along the U.S. East Coast by the Union of Concerned Scientists. In another 15 years, that number could jump to 400 floods annually, the study says. A home purchased in some of the more flood-prone parts of those two cities could see daily flooding before a 30-year...