Jim Prall has compiled a list of the authors of the IPCC Working Group 1 report for AR4. There are 618 WG1 authors, which is more than the 604 names on Inhofe’s list. There are just three names on both lists, which is no surprise given the shortage of climate scientists on Inhofe’s list.
I see Inhofe’s “Gang of 650” also includes Erich Roeckner, a renowned climate modeler at Germany’s Max Planck Institute, who’s quoted as saying there are still kinks in current climate models. But that’s not controversial; all climatologists recognize that their models can’t account for every last physical process. Inhofe’s report then cites Roeckner telling Nature in 2006, “It is possible that all of them are wrong”–implying that he’s casting doubt on the link between human activity and climate change. But he’s not! Roeckner was referring to the IPCC’s emissions scenarios, which involve assumptions about the rate of growth of greenhouse-gas emissions. (Scroll down here for the full quote.) We already know that emissions are growing faster than the IPCC’s worst-case scenario, and that’s bad news, not good.
Anwyay, Roeckner’s as far as you get from a “dissenter”: See this 2004 paper, which yet again establishes the link between greenhouse-gas emissions and temperature increases. Or see this link, where Roeckner is qutoed in multiple news stories sounding downright alarmist about the consequences of man-made warming. “Humans have had a large one-of-a-kind influence on the climate… Weather situations in which extreme floods occur will increase,” he informed Deutsche Welle in 2004. “Our research pointed to rapid global warming and the shifting of climate zones,” he told ABC News in 2005. Quite the heretic, that one.
“Without question, much more progress is necessary regarding our current understanding of climate and our abilities to model it. Before we can accurately understand the midlatitudes’ response to tropical forcing, the tropical forcings themselves must be identified and understood … Only after we identify these factors and determine how they affect one another, can we begin to produce accurate models. And only then should we rely on those models to shape policy. Until that time, climate variability will remain controversial and uncertain.”
Frauenfeld is talking about the modelling of ENSO events by General Circulation Models. He doesn’t think they as good at this as the IPCC does, but he is not saying that GCMs can’t successfully model the rest of the climate system.
So, Inhofe was only able to find one (out of 618) IPCC WG1 AR4 author who is a skeptic.