claim: ( 2009 ) have demonstrated recently  – the upper troposphere ( the only place where adding CO2 to the  atmosphere could make any difference to temperature ) is considerably  drier than the models are tuned to expect.
evidence: If, on the contrary, the upper air is cooler than predicted by the adiabatic lapse rate, then when the air parcel rises to its new height it will have a higher temperature and a lower density than its surroundings, and will continue to accelerate upward.