As shown in Figure 1, the actual increase in global surface temperatures has been less than Scenario B, which is the closest to reality.
They choose the MIDDLE emission scenario and admit that the temperature hasn't lived up to that forecast. England says the HIGHEST emission scenario applies and provided an accurate forecast!
Skeptical Science explain why,
1. Scenario B, which was the closest to reality, slightly overestimated how much the atmospheric concentrations of greenhouse gases would increase (particularly methane and chlorofluorocarbons [CFCs]).
2. Hansen's climate model had a rather high climate sensitivity parameter. Climate sensitivity describes how sensitive the global climate is to a change in the amount of energy reaching the Earth's surface and lower atmosphere (a.k.a. a radiative forcing).
[wrong because the input parameters where wrong, so it's not really wrong - argument Rebutted™! Skeptical Science...]
