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Fred, have a look at these critiques by Tamino and Stoat. The paper isn't left with much of a leg to stand on.
Also, I think the current IPCC AR4 WG1 conclusions are indeed tantamount to ruling out other causes for the recent warming (as distinct from the early part of the last century). See Jerry Mahlman's remark in this article. IMHO the only reason they didn't go to the highest level ("virtually certain") was to reserve it for the next report in 2013.