I don't know who to believe.
Anyone who takes the face-value of "Global Warming" is an idiot, and whoever believes that anything in the "Inconvenient Truth" should be taken as fact or actual statistics...well, I'm just plain sorry for you.
The "truth" is, most if not all of the "global warming" stuff is BullS. And I'm not just saying that. I've done my research, wrote a research paper or two, and listened two at least 10 different professional perspectives on global warming.
ALL of my studies have found this true: Climatic Change (as in, the earth's climate in various parts of the globe changing at a steady rate)
IS HAPPENING. It's a fact. Our planet is constantly going through changes; some of these changes have happened more rapidly than others. Some parts of the globe are warming up, and some are not, and there is no real set rate of the changes occurring; it depends on a year-to-year basis.
"Global Warming" would have you believe
This piece of garbage.
There is no evidence for any of it. Despite what Al Gore and the government would have you believe, we are not "Spiralling out of control" and headed for doomsday heat. Now, to Al's credit, there is some evidence that human impacts have indeed affected earth's temperature....about .3 degrees over the course of 200 years. Not what old Al is claiming.
There's so much more than this meager sample I'm giving you, but considering part of my bachelor's degree is directly related to this issue (an issue I take seriously) I hope you'll give my word for it. As for all the evidence and the like, try, TRY and track down the sources of these so-called statistics. They had an newspaper issue two years ago where a hacker managed to get a hold of some interesting emails stating that all their "data" on "global warming" was essentially made up to scare the public into doing whatever the hell the govt. wants you to do.