The azolla event drew down atmospheric CO2 from ~3500ppm to ~1000ppm. This should have resulted in a decrease in associated temperature from radiative forcing of ~5C. How fast do you suppose that decrease in temperature should have taken?Why do you all make such stupid arguments? Could it be because there are no valid ones for you to make?
The argument is that the relationship between CO2 concentration and SB's graybody "emissivity" factor is unknown ... seems that even demonstrating this relationship is beyond human ability ... the question remains unanswered ... how much does CO2 raise temperatures in isolation? ... and show your math please, this is physics, not astrology ...
You were making the argument that because human GHG emissions did not exist in the past when CO2 levels and temperatures were high, they could not be responsible for warming today. That is patently ignorant nonsense. Mamooth had a good analogy. There were forest fires in the past, long before the appearance of modern humans. Therefore humans cannot be responsible for forest fires today. Right?