The newest and most comprehensive report on the likely effects of global warming sees Florida’s Key West flooded—bad news for the dining and shopping destination “Margaritaville,” founded there by singer-entrepreneur Jimmy Buffet. The report from the National Oceanic and Atmospheric Administration also warned of a parched U.S. Southwest, a stormier Great Lakes region, and widespread disruption to agriculture. But even with all the new details, isn’t this sort of news getting too familiar to cause a real jolt? Will Congress, which is considering a global warming bill, do anything dramatic?