If China subscribed to such a system and agreed to operate on a level playing field, then I might give more credence to it. However they aren't, and they won't. No amount of sequestration in the United States or Canada will have a meaningful impact on world pollution unless the world's largest polluter is held accountable. Anything less than that is counter-productive, putting us economically at a disadvantage to a country, and a communist regime, that would like nothing more than to chip away at US hegemony in the world.