Here's a couple good articles by Scott Adams on things that would convince him on climate change. He mainly focuses on his experience with being able to manipulate models to show whatever you want them to show and what proportion is man-made vs natural.
http://blog.dilbert.com/post/158159613566/how-to-convince-sk...
http://blog.dilbert.com/post/158778029326/how-to-change-my-b...