Well, I'll throw this point in here: even if he did do something, by now it'd hafta be drastic, like banning all unnecessary travel, and there'd be an outcry because people don't want to give up their leisure for the environment. The government can only do so much while following its own rules; it's up to us to pull our end of it, and from the looks of things I don't think that's gonna happen until there's a major crisis like 9/11 or something. Also, it's not just him, there's the Senate and the House and all those other dudes that make the laws. Bush just okays/vetoes stuff from them, he can't really do much other than that (dang it my memory of government classes is failing me...)
It does, however, seem like he's not really interested in solving it or at least doing something...probably because he's outta there this coming year and so many people hate him. I dunno. Might also be this stupid Mexicanada or whatever this retarded country-merger is.