"We fixed the ozone layer and stopped acid rain. We can fix this. It just takes commitment." That's not a good comparison - ozone layer and acid rain were caus

"We fixed the ozone layer and stopped acid rain. We can fix this. It just takes commitment." That's not a good comparison - ozone layer and acid rain were caused by very specific externalities that were relatively easily substituted with "better" ones that didn't cause (for instance) ozone holes and acid rain. Carbon, on the other hand, is the least common denominator of human activity - so much so that even our breath produces it. I don't see any possible patterns of human existence on the earth that are ex-carbon. Carbon output is a simple function of population in a way that ozone and sulfur are not.