[wunderfool]

do people really believe that rapid climate change will reveal some new mass of desirable farm land? maybe in 5000 years as the soils adapt to new climates, but not fast enough to feed a hungry planet.

there are some lands on the periphery of existing arable zones that might become desirable in the short term, but certainly there will be a net loss worldwide...local economies have grown around existing arable zones, you have to transplant all that too

[redthrowaway]

That's what I was getting at. Too big a swing could, for example, hasten the expansion of the Gobi Desert, destroying millions of acres of arable land and endangering the food supply for a billion people.