Redux you don't seem to understand the AGW theory. Co2 has a limit in how much IR Radiation it can absorb and radiate back.
In AGW modelling Co2 absorbtion by itself does not result in a temperature increase of more than around 1-2 degrees. To get to the catastrophic warming of 4+ degrees requires hypothesied yet unproved feedbacks to start kicking in (eg methane releases from Siberian/Alaskan/Canadian permafrost.
If the world has been warmer and these regions previously 'thawed' as little as 1,000 years ago then clearly these feedbacks don't live up to the hypothesis.
