I'm not an expert, but I know a couple of experts. Professors from the UW-Madison Department of Atmospheric and Oceanic Sciences. I was chatting with one a couple of months back and asked him how widely was human-caused global warming accepted by the nation's top scientists in atmospheric sciences / meteorology. Was is 60-40, 80-20, or 90-10? He said it was more like 97-3. A handful of the 98 still think it is a minor contributor, so it might be more like 90 feel it is a strong factor, 7 a weak factor, with 3 undecided.

Here's a recent article from National Geographic:
http://news.nationalgeographic.com/n...l-warming.html