&gt;no mathematical function has been found to fit the observed data. Fact! Conclusion: the situation is much more complex than we currently understand and does not support the horribly destructive policies which are very much in the interests of a clique of politicians and folk with dependent jobs.<p>I don’t understand this thinking. The fact that we don’t have a good predictive model is extremely worrying. We may hit a non-linearity or positive feedback loop that increase the average temperature by 10C in a very short time (this is unlikely, but we can’t rule it out). The whole thing is like jumping off a cliff into the ocean when you have no idea what is under the surface.