Key points are not available for this paper at this time.
Estimates of the atmospheric temperature changes due to a doubling of CO2 concentrations have been with a static radiative flux model. They yield temperature changes >0.25 K. It appears that the much larger changes predicted by other models arise from additional water vapor evaporated into the atmosphere and not from the CO2 itself.
Newell et al. (Fri,) studied this question.