David McCandliss at Information is Beautiful has tried to create a big visual map of the arguments for and against human-caused global climate change (see below, click to enlarge).
He hasn’t quite succeeded. In part his format isn’t ideal for making the scientific case. In part “I deliberately chose not speak directly to any climate experts or leading scientists in the field. I used only publicly available web sources” — but he missed Skeptical Science, which would have perhaps led him to stronger and more cogent arguments.
Anyway, I guess I am ruled out as someone who can help him, so perhaps you all can give him some ideas: