Read here. In the ever growing portfolio of studies finding climate model failure, new research determines that actual upper troposphere temperatures are significantly below the predicted temps of the IPCC climate models. This finding represents the complete collapse of climate model validity.
All of the UN-IPCC's catastrophic scenarios depend on there being a high climate sensitivity, which will manifest itself as significant upper atmosphere warming in the tropical latitudes, thus leading to "accelerating" surface temperatures.
Unfortunately for the climate model alarmists, their entire simulated climate world, in actuality, is a climate sensitivity farce. Satellite empirical evidence from Fu et al "show little trend" over the 1979-2010 period. As a result, tropical surface temperatures are robustly below climate model predictions.
"As they describe it, Fu et al. examined trends in the temperature difference (ΔT) between the tropical upper- and lower-middle-troposphere based on satellite microwave sounding unit (MSU) data, as interpreted by both the University of Alabama at Huntsville (UAH) and the Remote Sensing System (RSS) teams, comparing both sets of results with AR4 GCM ΔT simulations for the period 1979-2010...report that the RSS and UAH ΔT time series "agree well with each other," and they indicate that they show little trend over the period of record. On the other hand, they state that there is "a steady positive trend" in the model-simulated ΔT results, concluding that the significantly smaller ΔT trends from both the RSS and UAH teams "indicate possible common errors among AR4 GCMs." In addition, they note that the tropical surface temperature trend of the multi-model ensemble mean is more than 60% larger than that derived from observations, "indicating that AR4 GCMs overestimate the warming in the tropics for 1979-2010... "it is evident that the AR4 GCMs exaggerate the increase in static stability between [the] tropical middle and upper troposphere during the last three decades,"" [Qiang Fu, Syukuro Manabe, Celeste M. Johanson 2011: Geophysical Research Letters]