text: Johnston cross examines and juxtaposes conclusions from numerous scientists to reveal "a rhetoric of persuasion, of advocacy that prevails throughout establishment climate science"(9). Complexities and uncertainties that might shake the confidence of policymakers are often concealed. For example, there is no mention of water vapor feedbacks in the IPCC AR4 "Climate Science" documents intended to influence the public and the media the Policymaker Summary and Technical Summary (24).