That 0.1 to 0.2 degrees Celsius over the next two decades represents the warming ONLY for the IS92a scenario (under different climate sensitivities). (realclimate.org)
In other words it's a rather friendly - world emissions scenario, that the researchers then differentiated into four separate members according to different climate sensitivity assumptions — and translating a global temperature rise to a local climatic response: (bitsofscience.org)
In particular, two commonly used methods for converting cumulus condensate into precipitation can lead to drastically different climate sensitivity, as estimated here with an atmosphere — land model by increasing sea surface temperatures uniformly and examining the response in the top - of - atmosphere energy balance. (climateaudit.org)