Andrew Lilico, a British economist, has an interesting discussion of the economic aspects of global warming politics over at ConservativeHome. This is particularly illuminating:

Now the Stern Review has been subjected to extensive methodological criticism, and I think it’s fair to say that the position amongst economists is something like the following: If we want to do any work on environmental economics for any government agency, we take the results of the Stern Review as given and unquestionable.When we are down the pub, or chatting in meetings with other economists, almost no-one takes any of its results seriously.

Confirmation bias is alive and well in Her Majesty’s Government.