A few months ago, on the Scientific American blog, George Musser lamented the malcommunication between global warming skeptics and proponents. He asked readers who were skeptical about the GW consensus to tell him why in comments. They did, to the tune of 170 comments.
In a follow-up post, Musser tried to summarize and taxonomize the objections (then, in response to tons of feedback, tried again).
I doubt we have many skeptics here, but if you're curious about what trips laypeople up -- rather a wider array of things than I would have thought -- it's worth checking out. And now I can finally close that tab on my browser.