People in New Orleans sometimes say casually that the city “will be underwater” eventually, and we should enjoy it while we can. But a new paper in Nature Sustainability, covered by the Guardian, argues that this is no hyperbole. Yes, the authors say, New Orleans will be underwater, and sooner rather than later. The city is doomed, they say, and we should all leave. The situation, they claim, is hopeless. Rising sea levels will inundate south Louisiana within one generation, and the question we should now be asking is how to relocate the entire population in an orderly manner.