CBAT offers users 5 different levels of 'climate-sensitivity' going Left to Right from Low to High: -
[1] 1.5, [2] 3.0, [3] 4.5, [4] 6.0, [5] 7.8 degrees C 'equilibrium temperature for 2xCO2 atmosphere CO2. Based on a survey of the literature and with reference to the work of the Apollo GAIA project: -