This is an interesting Documentary that I found on the Net. It was actually shown In England a few weeks ago on channel four, so some forum members may have watched it before. Basically it challenges the popular theory that humans are the main cause of global warming.
http://video.google.co.uk/videoplay?doc ... ocumentary
I reccomend watching it, it's very interesting (Although maybe a little long, so I'd start watching it when you have an hour to spare...if you have an hour to spare that is....).