There have been various efforts on this front over the years. This was one of the key ones:
The scientific consensus on climate change by Naomi Oreskes 2004 (looking at papers on climate change): http://www.sciencemag.org/
“Many details about climate interactions are not well understood, and there are ample grounds for continued research to provide a better basis for understanding climate dynamics. The question of what to do about climate change is also still open. But there is a scientific consensus on the reality of anthropogenic climate change. Climate scientists have repeatedly tried to make this clear. It is time for the rest of us to listen.”
And for even more:
http://en.wikipedia.org/wiki/
“Several surveys have been conducted of the opinions of scientists on anthropogenic climate change. They have generally concluded that the majority of scientists are convinced that human activity is causing global warming.”