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The Environmental Protection Agency on Monday will announce the most sweeping effort to date by the United States government to combat climate change: a draft rule to seek a 30 percent reduction in carbon emissions by American power plants by the year 2030. The new plan will eventually completely restructure the U.S. energy industry, but give states a menu of options for how to achieve their emissions, including choices that wouldn't require them to immediately shut down coal-fired power plants, the largest source of greenhouse gases that have lead to the dangerous rise in global temperatures.