"The poorest Americans use three time the energy as the percentage of their income as the average American does. This is going to disproportionately hurt the poor. It may make the whole electric grid unstable, depending on how it is enforced. And it does nothing for the climate."

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Where there is a confluence of interests among nations, as, for example the swine flu or polio, you can get well functioning international institutions like the World Health Organization. And you can act. Climate change is different, because the science remains hypothetical and the potential costs staggering.

— Charles Krauthammer