At OP-
Well it depends on who you believe and are convinced by.
The vast majority of climatologists (you know, the guys who actually do the research and come up with the data) are almost certain Global Warming is due to human activity.
http://en.wikipedia.org/wiki/Scientific_opinion_on_climate_change
Then you have some who think it's all blown out of proportions or is a liberal/green/commie hoax but those who are advocating that position don't tend to be climatologists but rather right wing politicians or conspiracy theorists.
People like:-
Republican Congressman John Shimkus (God told Noah there won't be anymore floods)
http://www.politico.com/news/stories/1110/44958.html
Or conspiracy theorists like Alex Jones or David Icke (It's a NWO scheme to kill off the planets population so as to make it a playground for the rich and powerful)
