Much use has been made of Climate Models by the scientific community, this has led to many predictions and consensus estimates. As an engineer who has delivered many communication products but particularly microwave radio links I understand the value of calibration charts.
The paleoclimate studies have supplied us with just such a calibrartion chart see Wikipedia for info
These two graphs compiled after years of investigation of the climate record provide both a more accurate record of historic climate and future climate changes. A baseline measurement of current average global temperature applied to these ‘calibration charts’ indicate very low climate sensitivity, and low thermal response of the climate system.
They also indicate that going forward temperature fluctuations will be driven by insolation, NOT CO2