In addition to regulating fuel economy, EPA is applying Clean Air Act permitting requirements to
large stationary sources of greenhouse gases: power plants, refineries, steel
mills, pulp and
paper factories, and cement production facilities.63 EPA will soon establish greenhouse gas New Source Performance Standards (NSPS) for coal - fired power plants and petroleum refineries.64 If these go unchallenged, it is likely that EPA will develop greenhouse gas performance standards for numerous other industrial source categories.