Obama faces battle on new clean-air rules

In a shift for the administration, the EPA adopts tough limits on mercury and other toxic emissions from power plants. Industry groups say the rules are too costly and could affect the nation's electrical grid.The Obama administration has adopted tough new limits on mercury and other toxic emissions from power plants, winning praise from environmentalists and public health advocates but sparking warnings from industry groups that contend the new regulations are too expensive and will place dangerous pressure on the nation's electrical grid.

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