Dr Roger A. Pielke Sr.
"Quite frankly, this would be a good Master’s thesis study to show why CO2 is an important climate forcing as well as provide insight into the water cycle feedback. However, it presentation as a major new research insight by Science is puzzling,.."
Dr Roy Spencer:
"As I have already pointed out, the authors have predetermined what they would find. They assert water vapor (as well as cloud cover) is a passive follower of a climate system driven by CO2. They run a model experiment that then “proves” what they already assumed at the outset.
But we also need to recognize that their experiment is misleading in other ways, too."
The a paper itself appears to be a re-hash of Lacis comments made at Andy Revkin's Dot Earth blog under the header "Lacis at NASA on Role of CO2 in Warming"