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White House, EPA Move To Ease Mercury Rules (washingtonpost.com):
"The Bush administration is working to undo regulations that would force power plants to sharply reduce mercury emissions and other toxic pollutants, according to a government document and interviews with officials.

The Nov. 26 document makes the case that the Environmental Protection Agency, under President Bill Clinton, misread the Clean Air Act's requirements and that there are less onerous ways to reduce the emissions."

I'm sure it will come as a complete surprise to everyone to learn that coal-fired power plants are the primary mercury and nickel polluters.