CO2 is a pollutant? Tell that to the plants."

http://www.slate.com/blogs/weigel/2012/02/26/co2_is_a_pollutant_tell_that_to_the_plants_.html

DAVISON, Mich. -- The above was one of the blockbuster lines from Rick Santorum's speech here. As the primary approaches, as gas prices go up, we're hearing more from Santorum about how he never fell for "man-made global warming," how he understood that it was "political science, not climate science," and how he will approve the Keystone Pipeline as soon as he gets the pen in his hand.