What's the worse that could happen?

Greg Craven is the guy who injected himself into the AGW deniers propaganda war two years ago, with a simple risk analysis grid pointing out the obvious — that, if the scientists are wrong, the worst that could happen is that we move to a carbon free economy sooner in our history than otherwise, but if the AGW deniers are wrong (ie. the scientists are right), we are toast. Then he did not sleep