I'm not against a global pact to reduce CO2. Indeed, I favor it. But in the absence of one - and there is no chance of getting one in the foreseeable future - there is no point in America committing economic suicide to no effect on climate change, the reversing of which, after all, is the alleged point of the exercise. For a president to propose this with such aggressive certainty is incomprehensible. It is the starkest of examples of belief that is impervious to evidence. And the word for that is faith, not science.