Manmade Global Warming - New Extremes, page-2605

Of course it is Mudguts, as indeed you are.
so CO2 levels in the air have a saturation point beyond which they have no effect.
so all that guff other deniers quote on here about much higher CO2 levels at times past in history of no import.
anyway, back to my original question. Can you please cite a source for your claim about CO2 saturation levels in the air.
you clearly aren't one.