Uncertainty and Conservatism

In a comment by Onar Aam on RC, it is alleged that proposed policy responses to anthropogenic climate change are excessive because scientific uncertainty leaves open the possibility that the sensitivity of the system is much smaller than the consensus would have it. This argument is common enough.

For almost fifteen years now I have been (using my unfortunately trivial influence; though for some reason Fergus seems to be singlehandedly trying to change that; thanks Fergus!) pointing out that such an argument is totally wrong, pretty much exactly 180 degrees off the mark. [more]