in my opinion it doesn't really matter if anthropogenic global warming is true or not. the things that "supposedly" cause global warming are bad in many other ways too and it wouldn't be that hard to reduce them...

...but in the grand scheme of things all of this doesn't matter anyway since earth is a self-regulatory system and the human race will get what it deserves.

edit:
i just came across this video:
http://www.youtube.com/watch?v=1-0vnRmej0Q
kind of related...