No one is saying CO2 is "evil", just that there are limits to how much we can safely emit into the atmosphere.
Incidentally, "carbon trading was invented by Ken Lay" is a classic logical fallacy. It's no better than saying "assembly lines were implemented in the auto industry by Henry Ford, a notorious anti-Semite who was decorated by Adolf Hitler and personally refused to assist in the war effort". Ford's evils don't invalidate the fact that cars are affordable, and Lay's evils don't invalidate the theory of anthropogenic global warming.
"carbon trading was invented by Ken Lay"
I've looked into it and you're correct on this (both accuracy and logical fallacy usage). You won't hear this from me ever again.
Also on the 'evil' statement - poor choice of words. I was referring to the EPA declaration of Co2.
While I think internalising the externality is a fine idea in terms of controlling it, if co2 is so evil and so dangerous, why are we not talking of a finite ban, like DDT or Fluorocarbons?