I saw An Inconvenient Truth. I thought it was pretty good. I also followed up by surfing the net to back up the some of Gore's claims. My largest problem is his insistence, along with his supporters, that there's nothing to debate: global warming is created by humans, it will destroy the earth, and its up to us to stop this from happening.
I find it insulting when anyone says there's "nothing to debate", which discourages people from looking deeper into the issue. While I don't think this is a political tactic, as some right wingers insist, but is just Gore being overzealous with his research and beliefs.
However, I find this recent critique by the US Senate Committee on Evironment and Public Works to support Gore's view that humans can destroy the environment more than the pieces intent to partially discredit Gore.
Gore’s claim that global warming is causing the snows of Mt. Kilimanjaro to disappear has also been debunked by scientific reports. For example, a 2004 study in the journal Nature makes clear that Kilimanjaro is experiencing less snowfall because there’s less moisture in the air due to deforestation around Kilimanjaro.
In short, it isn't emissions that are altering the enviornment, but the chopping down of trees.