I think Global warming is closely related to overpopulation/pollution, some of the same products will lead to both of these occurring. While we might be able to adapt to a hotter planet would we really want to if the whole place is covered in refuse and you have to live in a tiny cubicle. That is the way the world is going if something isn't done to stop it.

It would be nice if we could make a fresh start on a new planet with our current technology available but that is looking less and less likely it is likely we would have to settle for a crappy planet that isn't half as good as earth. (Think an Arid planet in Master of Orion vs a Gaia planet, which would you want to live on?)