Nic Lewis has published another paper on objective Bayesian approaches in climate sensitivity study. This looks at an old but very important paper by David Frame and Myles Allen, which implied the use of an objective approach, but actually turned out not to. Lewis's paper looks at two genuinely objective approaches to the problem and compares the essentially identical results they give to the clearly erroneous and inevitably much more alarming one obtained by Frame and Allen.
A very technical blog post on the subject is up at Climate Audit, and the paper is here.