It's possible that they are skeptical because of the scare tactics used by some (such as Al Gore and James Hansen) that we are in a "crisis" and close to the "tipping point" and that we must take action NOW!

http://www.telegraph.co.uk/news/main.jhtml?xml=/news/2006/12/10/nclimate10.xml

The IPCC has been forced to halve its predictions for sea-level rise by 2100, one of the key threats from climate change. It says improved data have reduced the upper estimate from 34 in to 17 in.

Unfortunately due to some of these scare tactics, some people actually believe that sea levels will rise by 20 feet by the end of the century.

>I know there's at least one person out here who doesn't think that global warming is happening (or being caused by humans) cause he/she had a post saying so before.
>I'm still confused as to how anyone can think there is no such thing, but anyway it's been known for a while that politics are driving the science instead of the science driving the politics. Kinda a dangerous thing if you ask me....
>
>http://www.ucsusa.org/news/press_release/ExxonMobil-GlobalWarming-tobacco.html