But how de we know - a priori - that an earth 5 or 10 degrees F hotter would be worse than the current earth? It would be different, probably profoundly so, but we cannot say that it would be better or worse without injecting some kind of specious ethical judgement...and - another thing that is incontroverably true - Mother Nature ain't ethical.

I would gladly evaporate the last ounce of coal into the atmosphere in order to give a single human infant the chance of a full life, one that partakes of all of the fruits of our civilization. There is a heavy, heavy burden of persuasion on the shoulders of those who advocate otherwise.