So if a scientist questions the adequacy of present climate models, or fails to find conclusive evidence for global warming in a particular data - set, he or she is often reported as claiming that «there isn't really a problem». (usask.ca)
Clouds also are the largest source of uncertainty in present climate models, according to the latest report of the Intergovernmental Panel on Climate Change. (sciencedaily.com)
They demonstrate or explain more precisely the asmytric relationship between f and S in present climate models (so, they use mean or better estimates of these models without any opinion about the quality of these estimates). (realclimate.org)