Rising sea, sinking land
Sea level is rising an inch every seven or eight years in the Hampton Roads area of Virginia, more than in most coastal areas, partially because of sinking caused by an ancient impact crater. Without intervention, low-lying land will eventually be underwater. The Environmental Protection Agency wants jurisdictions such as Virginia Beach and Norfolk to decide where to try to stave off the water and where to give in and let nature take over.
Sources: Virginia Institute of Marine Science, NOAA, EPA. Gene Thorp/The washington Post.