COPENHAGEN – For the better part of a decade, I have upset many climate activists by pointing out that there are far better ways to stop global warming than trying to persuade governments to force or bribe their citizens into slashing their reliance on fuels that emit carbon dioxide. What especially bugs my critics is the idea that cutting carbon is a cure that is worse than the disease – or, to put it in economic terms, that it would cost far more than the problem it is meant to solve.