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Because the world's climate is a public good, game theory predicts that this kind of thing won't ever work.

We are semi-rational actors in a dynamic competitive system. We can all want X to happen, and be willing to spend money to make X happen, but realize that doing so would make our own lives worse because of the non-participation of others, and so we contribute to making X happen not directly, but instead by trying to put rules in place that enforce participation.

I refer you to: http://en.wikipedia.org/wiki/Public_good http://en.wikipedia.org/wiki/Tragedy_of_the_commons http://en.wikipedia.org/wiki/Game_theory

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