Actually Squidgy you are wrong, when you claim that that CO2 levels above 400 ppm is "a unique situation in history (and) must be pondered separately but understanding and modelling the past will help under today and eventually models for the future."
My reading of Earth's history shows 5 of the 6 extinction events were directly related to CO2 levels in the atmosphere.
And you're also wrong on the following That "Even the central themes - CO2 causing warming - we can measure its effect right now - the future will get much warmer, much quicker; are in valid dispute."
They aren't in valid dispute beyond a few isolated boundary riders suffering attention deficit syndrome.
The central theme regarding the impact of CO2 is widely understood and agreed.
You're a good denialist then aren't you? Denialists deny facts.
