Ever since the Clean Air Act was amended and toughened by Congress over their strenuous objections in 1970, automakers have argued loudly that the law's standards for exhaust emissions on '75 and '76 model cars will be all but impossible to meet. For all their efforts, they failed to make their plight quite believable to William D. Ruckelshaus. Earlier this year his Environmental Protection Agency summarily rejected the automakers' application for a delay in the deadline. Last week, in a major change of strategy, General Motors disclosed that its scientists were farther...
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