Can Cap-and-Trade Survive a Papal Denunciation?

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A papal encyclical is the highest form of teaching from one of the world's most powerful religious leaders. Pope Francis' message on climate change insists there's a moral imperative to save the Earth and serve the least among us by limiting greenhouse emissions. Part of the argument is a critique of the cap-and-trade system, which is basic to California's war against air pollution — and it took many environmentalists by surprise.