[cogitator]

Unless, of course, the opposite is true - that an average global increase of 3 degrees Celcius triggers a doubling of CO2 in the atmosphere.

Still working on explaining this in my profile. You have to have a different radiative forcing factor capable of inducing that large a temperature change independent of atmospheric CO2 concentrations. The main secondary factor (speaking from the paleoclimate community perspective) in glacial-interglacial transitions was albedo. On Berner's timescales, erosion rates and plate tectonics are major players.

[dirtboy]

Still working on explaining this in my profile. You have to have a different radiative forcing factor capable of inducing that large a temperature change independent of atmospheric CO2 concentrations

Gee, maybe the sun did it?