You Canadians in the group already know it, but for the benefit of the Yanks in the crowd the CBC has a better investigative journalism outfit on TV than anything (outside of PBS's Frontline) in the US: the fifth estate.
Their latest story directly involves this group. They expose those scientists who cast doubt on the global warming debate through obfuscation and denial. See "
The Denial Machine" online, or catch it on cable later.
Not to be missed.