Richard Lindzen has *always* been an anti-climate change guy - he's probably the most-credentialed ("Oooooh, MIT!!!") of the scientists in that camp and is treated like a celebrity by them. Thing is, plenty of his own research on the matter has been shown to be flawed, the whole "iris mechanism" theory was full of errors that even he's fully admitted in hindsight.
This is a decent article that sums up the info & different viewpoints on his work, if anyone cares to actually inform themselves (unlikely for GFY, I know) rather than posting sound bites & cherry-picked quotes from Tucker Carlson's tabloid.
http://www.nytimes.com/2012/05/01/sc...issenters.html