I have mentioned climate sensitivities in a few threads in the past. with the leak of SOD of AR5, it has been brought to the forefront again. Ridley's WSJ article- Matt Ridley: Cooling Down the Fears of Climate Change - WSJ.com if you are actually interested in the details- Why doesn’t the AR5 SOD’s climate sensitivity range reflect its new aerosol estimates? | Watts Up With That? doesnt this take the 'catastrophic' out of CAGW? at the very least it gives us much more time to realistically improve technology to reduce CO2 emissions.