First, if you look at the other ice ages we have had in the history of Earth, it becomes quite obvious that global warming is not man-made.

Second, I don't think global warming is anything more than an easy way for governments to collect money for ridiculous projects. Anything and everything they can think of can be tied to the environment one way or another -- so the amount of money needed to combat said "global warming" is really endless and all-encompassing.

Third, they would never relocate people in areas affected by global warming. Unless, of course, you are referring to the possibility that coastlines in Florida (for example) may disappear in the next thirty years or so. Obviously, these people would need to be relocated. However, I can also assure you that they will not be provided an alternative living arrangement until their current property is completely submersed under water for quite some time.

Lastly, global warming affects everything. There are not enough places that remain unaffected to move people to -- plus, it would simply be passing the problem from one area to another if you buy into man-made global warming.

In short: Too many people to move, not enough places to move them.