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Summary: Clean-energy technology is expensive and the United States is spending far too little on developing it. The U.S. government must do more to promote cross-border innovation and protect intellectual property rights.

Coal combustion is the largest source of carbon dioxide emissions on the planet. But the fuel isn't going away anytime soon, since demand for it is ballooning in the developing world. So instead of indulging in quixotic visions of a coal-free world, policymakers should focus on supporting new technologies that can reduce how much carbon coal emits.