Ole Humlum, Professor of Physical Geography at the Institute of Geosciences, University of Oslo,
"Global climate models are often defended by stating that they are based on well established laws of physics. There is, however, much more to the models than just the laws of physics. Otherwise they would all produce the same output for the future climate, which they do not. Climate models are, in effect, nothing more than mathematical ways for experts to express their best opinion about how the real world functions."
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