You know, up until recently that was one of my biggest points against America, but after reading the book "state of fear" by Michael Crichton I did some reading about the matter and I now truly believe that there is NO evidence to support global warming!
There is a lot of information on this topic floating around the web, so if you want to find out anything more about the topic I would suggest you search for it on google (or any other site i.e. science journals) and read some of the articles (both for and against) and then decide what side you want take.
Don't get me wrong though, it's not that I don't think the Kyoto protocol is a good thing, because it is! Even if the main threat it was intended to counter does not exist it still does a wealth of good to lower pollution levels. No one can say pollution is a good thing, after all we do need clean air to breath