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The Supreme Court handed down a big ruling on EPA regulations for smokestack emissions on Tuesday, which the Associated Press described as “an important victory for the Obama Administration in controlling emissions from power plants in 27 Midwestern and Appalachian states that contribute to soot and smog along the East Coast.”

The rule, challenged by industry and upwind states, had been cast by foes as an attempt by the Obama administration to step on states’ rights and to shut down aging coal-fired power plants. Opponents said the decision could embolden the agency to take the same tack later this year when it proposes rules to limit carbon pollution. EPA Administrator Gina McCarthy has said the agency will be flexible and work with states on the first-ever controls on power plants for the gases blamed for global warming.