  In this paper we will prove that GCM-models used in IPCC report AR5 fail to
calculate the influences of the low cloud cover changes on the global
temperature. That is why those models give a very small natural temperature
change leaving a very large change for the contribution of the green house
gases in the observed temperature. This is the reason why IPCC has to use a
very large sensitivity to compensate a too small natural component. Further
they have to leave out the strong negative feedback due to the clouds in order
to magnify the sensitivity. In addition, this paper proves that the changes in
the low cloud cover fraction practically control the global temperature.
