Few things seem more uniquely American than spray cans, which are used for almost everything from deodorants to oven cleaners. Americans are the major consumers of the spray products sold in the world today. But they may soon have to learn to live without them. A committee of the National Research Council concluded in a report released last week that the fluorocarbon gases used as propellants for spray products deplete the ozone layer. It is that shield which protects the earth from an overdose of the sun's potentially deadly ultraviolet rays. The...

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