Say what you will about the looming catastrophe facing the world as the pace of global heating and polar melting accelerates. There is a silver lining. Look at a map of the US. The area that will by completely inundated by the rising ocean—and not in a century but in the lifetime of my two cats—are the American southeast, including the most populated area of Texas, almost all of Florida, most of Louisiana, and half of Alabama and Mississippi, as well as goodly portions of eastern Georgia, South Carolina and North Carolina. While the northeast will also see some coastal...