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In another proposed reversal of an Obama-era standard, the Environmental Protection Agency Friday said limiting mercury and other toxic emissions from coal- and oil-fired power plants is not cost-effective and should not be considered "appropriate and necessary."

The EPA says it is keeping the 2012 restrictions in place for now, in large part because utilities have already spent billions to comply with them. But environmental groups worry the move is a step toward repealing the limits and could make it harder to impose other regulations in the future.

A veteran Ohio environmental regulator says Republican Governor John Kasich is forcing him to resign after pressure from the coal industry.