"In the abstract, given the facts about who is to blame, it would not be illogical for the United States to compensate the rest of the world for the damage it has done to global well-being, which is potentially considerable (bearing in mind that global warming may eventually lead to a loss of 5–20 percent of global GDP, if not more). In practice, it is quite unlikely that the United States would spontaneously undertake to do this."
-- #ThomasPiketty "Capital and Ideology"