The following letter to the editor appeared in todays Milwaukee Journal Sentinel...I am looking at writing a response.
My understanding is that CO2 acts as a one way valve, letting in the short wavelength radiation from the sun, but trapping the infrared radiation given off by the Earth, much like a green house. I belive the flaw in his argument (well, the biggest flaw...there are more than one!) is that he believes CO2 is transpartent to all radiation when he uses the word "colorless" or that he simply ignores any other form.
Any comments before I put keyboard to email and send a letter is welcome!