that human activitity is a significant contributing factor to the observed changes we have seen in global temps over the last century according to a newly published study in EoS link to article. the entire results can be found published as a book here
Despite the concerted efforts of industries connected with fossil fuel production and a handful of right wing Internet bloggers to create the impression that there is serious debate within the scientific community as to whether the Nobel Prize winning IPCC report and its supposed consensus are indeed as probable as they proclaim, contending that the IPCC is a biased political process which seeks to crush the plethora of dissenting voices, this paper by Doran and Zimmerman empirically confirms the perspective advanced by Naomi Oraskes in 2004 that within scientists working on peer reviewed material surrounding climate science there is virtually no support for the position that humans are not significantly contributing to the observed changes in climate.
Recent polls looking at public opinion on the matter suggests that 58% of the general public would concur with the statement, again highlighting the large discrepancy between the position on the matter of those actively engaged in the subject and laypeople. Indeed the paper’s conclusion is that
It seems that the debate on the role played by human activity is largely nonexistent among those who understand the nuances and scientific basis of long- term climate processes. The challenge, rather, appears to be how to effectively communicate this fact to policy makers and to a public that continues to mistakenly perceive debate
While the science must continue to be advanced and refined, the chief challenge which this paper suggests faces the scientific establishment surrounding Anthropogenic Climate Change (ACC) is to win the media war in conveying a clear understanding of the science and likely effects of ACC in the face of a dedicated smear campaign run largely run by the fossil fuel industry and right wing think tanks who oppose ecological reform on the basis that it threatens profit margins.