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: In 2010, astronomers imaged the GRS in the far infrared ( from 8.5 to 24 μm ) with a spatial resolution higher than ever before and found that its central, reddest region is warmer than its surroundings by between 3–4 K. The warm airmass is located in the upper troposphere in the pressure range of 200–500 mbar.