Global warming is 'pseudoscientific fraud'

The Register reports:

A heavyweight American boffin has apparently dubbed the global warming movement "the greatest and most successful pseudoscientific fraud I have seen in my long life as a physicist", and resigned in protest from the American Physical Society, saying that the society has deliberately stifled debate on the subject.
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In [his resignation letter], physicist Harold Lewis (emeritus prof at the University of California) writes as follows:

It is of course, the global warming scam, with the (literally) trillions of dollars driving it, that has corrupted so many scientists, and has carried APS [the American Physical Society] before it like a rogue wave. It is the greatest and most successful pseudoscientific fraud I have seen in my long life as a physicist. Anyone who has the faintest doubt that this is so should force himself to read the ClimateGate documents, which lay it bare ... I don't believe that any real physicist, nay scientist, can read that stuff without revulsion. I would almost make that revulsion a definition of the word scientist.