AAAS president John Holdren on climate skeptics

To be credible, the handful of “skeptics” about human causation of current global climate change would need both to explain what alternative mechanism could account for the pattern of changes that is being observed and to explain how it could be that the known human-caused buildup in GHG is not having the effects predicted for it by the sum of current climate-science knowledge (since, by assumption, something else is having these effects). No skeptic has met either test. 

John Holdren, “The energy innovation imperative.” Innovation, p.11 (Spring 2006).

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