Actually, it doesn't matter whether people believe (or not) that humans contribute to global warming. The science tends to say it does, but heck, why let science get in the way of a good opinion?
Question is: does it really matter at this point who or what is at fault? Only the most delusional (yet surprisingly vocal) would disagree that we are seeing a period of rapid global climactic change. So what matters is finding solutions to the very real threat these changes pose. Of course, the poorer countries are going to get hit the hardest - as usual. Which means the richer countries probably won't give a flying rats arse, as they'll just be able to plunder the other nations more easily.
Ah, screw it. Everyone for themselves, let the rest drown or starve or get buried in sand. That seems to be the general gestalt of what I'm hearing in this and other comment areas. Seems http://www.vhemt.org/ (or even the involuntary movement) is picking up steam - like it or not.