Here is another report that disagrees with the IPCC about the cause of mean near surface of earth temperature increase during the twentieth century. The IPCC's latest work says the 95% of the increase was due to man's activities. This report from the Research Triangle in North Carolina says 69% was due to the Sun. This report is fairly technical, so it may be that some can't appreciate it. Personally this report looks reasonable to me. And I think that the man's activities responsible for the 31% or whatever it is involve more than just emission of greenhouse gases, particularly in the area of land use.

http://www.fel.duke.edu/~scafetta/pdf/opinion0308.pdf