Slide 6 in this series.
Clouds are a key piece of how energy is released to outer space. If clouds cannot be modelled well then the hope of having accurate models is made if not impossible but certainly questionable. Even the reports written by the IPCC admit to such a problem in their models. It was been so stated for several AR reports.
The quotes below provide that input.
NEXT: How has the IPCC handled the hockey stick, and what conclusions can be drawn?
The breakdown of the IPCC, its motives and methods are found in these pages.