The theory of global warming is a gigantic weather forecast for a century or more. However interesting the scientific inquiries involved, therefore, it can have almost no value as a prediction. Yet it is as a prediction that global warming (or, as we are now ordered to call it in the face of a stubbornly parky 21st century, “global weirding”) has captured the political and bureaucratic elites. All the action plans, taxes, green levies, protocols and carbon-emitting flights to massive summit meetings, after all, are not because of what its supporters call “The Science”. Proper science studies what is – which is, in principle, knowable – and is consequently very cautious about the future – which isn’t. No, they are the result of a belief that something big and bad is going to hit us one of these days.