Link to the a story on Climate change in the latest issue of the American Chemical Society (ACS) weekly Chemical and Engineering News. The ACS has taken an official position that Global Warming has a human causation...much to the consternation of a good chunk of the membership. The piece, however, is reasonably balanced with beliefs of both extremes presented as well as those that think while CO2 is a partial cause it's not the only cause and not the largest cause. Thought it was an interesting read.
http://pubs.acs.org/cen/coverstory/87/8751cover.html