some preliminary conclusions: A distinction must be made between transient climate sensitivity, equilibrium sensitivity and the equilibrium time. (realclimate.org)
[Drew T. Shindell, Inhomogeneous forcing and transient climate sensitivity] That means climate change with an increase of more than a degree Celsius compared with the last century is very likely already. (scientificamerican.com)
Likewise, we find that natural variability, this last decade warming on the low end compared previous decades, the lack of coverage in the Arctic and so on may have played a role in Lewis» underestimating transient climate sensitivity: (realclimate.org)