Environment: Week's Watch

The President had good reason to feel optimistic about industry's antipollution efforts last week as he stood on the White House lawn watching two TWA jets take off from Washington National Airport. As a Chicago-bound 727 soared over the Potomac, the ship's Pratt & Whitney engines gushed black smoke, smearing the blue sky like a grease pencil. Two minutes later an Indianapolis-bound 727 with the same type of engines followed suit—but without trailing any visible wake. "That's quite a difference," Nixon beamed to TWA Chairman Charles C. Tillinghast Jr. standing beside him. "That's...

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