text: Finally, if, as Lindzen (2008) has suggested, all terrestrial forcings were cut by two-thirds to take account of the absence of the altitudinal difference in decadal warming rates in the tropics that is predicted in all of the models on which the IPCC relies but has not been observed in half a century of radiosonde observations and 30 years of satellite records (Douglass et al., 2007), climate sensitivity would again decline