The great failure of the climate models

[skepticalmike]

Be it 10 or 100 times inaccurate, "NASA has conceded that climate models lack the precision required to make climate projections due to the inability to accurately model clouds."

One person at NASA made that claim. Most of the uncertainty has to do with how much of a positive feedback clouds are. If the climate sensitivity is 3.0 degrees C. for a doubling of CO2, then

the RCP4.5scenario would give us about 3.0 degrees C. of warming by 2100, which is very dangerous. Paleoclimate studies (not involving computer climate models) of the temperature,

greenhouse gas changes, and albedo changes during the past 400,000 years arrive at a climate sensitivity of around 3.0 degrees C.