THREE years ago, Congress made a brave attempt to legislate into being technology that did not exist: it told U.S. automakers that by the time 1975-model cars rolled from assembly lines, pollution from auto exhausts would have to be cut to levels Detroit's engineers could not then reach. Ever since, the air has been filled with a smog of contradictory warnings. Environmentalists argue that Detroit must be held to the deadline or it will stall endlessly on the job of cleansing exhausts. Automakers insist that the standards are still technically unfeasible. Last...
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