There was a real climatologist on C2CAM the other night. Among lots of other things, he pointed out that lots of people will benefit from a warmer climate. And, if you look at where, calendar-wise, the warmer temps are occuring, it's in the Winter. Shorter winters=longer growing seasons.
With longer growing seasons, they can produce more corn-based ethanol, and warmer Winters (it's about 15F outside now) less energy is needed.