First of all, I am basing that on this article: http://www.rollingstone.com/politics/news/global-warmings-terrifying-new-math-20120719 http://www.rollingstone.c

First of all, I am basing that on this article: http://www.rollingstone.com/politics/news/global-warmings-terrifying-new-math-20120719 http://www.rollingstone.com/politics/news/global-warmings-te... Now, this article implies that we need to leave some coal and oil in the groud, even if it's economic to mine and use it up. My main concern is I don't think that markets can handle this task. Markets are great at exploiting all available resources; but how do you constrain them not to do that? You cannot set any price on a resource that you do not want to use at all. In a way though, yes, it's about externalities.