We have two excellent professional papers to review and compare. The first is by William A. van Wijngaarden and Will Happer. They calculate the CO2 climate sensitivity – the temperature increase when CO2 doubles – is 2.2 K for a fixed relative humidity.
The second is by David Coe, Walter Fabinski, and Gerhard Wiegleb. They calculate the CO2 climate sensitivity is 0.50 K for a fixed relative humidity of 0.8.
Both teams used HITRAN calculations. Both teams know how to make accurate calculations. Yet, one team gets 2.2 K and the other team gets 0.50 K.
Who can tell us which team has calculated a more correct value for climate sensitivity and why their results differ?