I happen to be on a committee at the Arizona-Sonora Desert Museum that is looking into the subject of climate change for possible inclusion in our interpretations of the desert. Several members of the committee keep referring to the National Climate Assessment Report as the last word on the subject, proving that humans are the main driver of climate.
The report claims “Multiple lines of independent evidence confirm that human activities are the primary cause of the global warming of the past 50 years.”
So I decided to download the report to see what the “evidence” was. You can download the full report (36Mb) here: NCA3_Climate_Change_Impacts_in_the_United States_LowRes.pdf
The bottom line of my analysis: NCA presents no unequivocal evidence that supports their contention of significant human induced warming.
You can read my analysis on my blog here:
http://wryheat.wordpress.com/2014/11/15/national-climate-assessment-lacks-physical-evidence/
See also:
UN IPCC Synthesis Report is a pack of lies