Responding to more silliness from TCS:
The authors of the NAS report cited in the first paragraph, and used as the basis of this article, write:
"...the committee finds it plausible that the Northern Hemisphere was warmer during the last few decased of the 20th century than during any comparable period over the preceeding millennium.
"Surface temperature reconstructions for periods prior to the industrial era are only one of multiple lines of evidence supporting the conclusion that climactic warming is occuring in response to human activities..." (pp. 3-4)
For some reason, the author of this article doesn't mention this part of the report. It could be, I suppose, that this part - which is the report's overall conclusion - directly contradicts his point.
The sad and yet oh-so-revealing thing about this sort of dissemblance is that it is utterly shameless.