Whoever claimed "we all die" was the worst case scenario. That's really over the top.

In fact, those most at risk early on have the most to gain. Instead of concentrating on somehow reversing the trends (which I'll say again are not unusual historically, even within the history of mankind since we began writing it down,) why not build floating cities to replace the island and coastal regions at risk. And, as I implied, we might find the great deserts becoming lush again, and if not, we have the technology to bring the water to the deserts. (Even in this country, with the Columbia spilling millions of gallons of fresh water into the pacific every minute, we could certainly divert a million an hour to southern California.) Costly, but less so than a futile battle (imo) against a natural cycle, even if we are making it happen faster.