1970 - 1974

The vulnerability of the ozone layer is demonstrated.

The atmospheric ozone layer absorbs most of the sun's ultraviolet light that would otherwise harm life on Earth. Three chemists -- the Dutch-born German Paul Crutzen, the American F. Sherwood Rowland, and the Mexican-born American Mario Molina -- explore natural and artificially induced processes that destroy ozone. Their work contributes to the 1987 international Montreal Protocol, which phases out the production of certain refrigerants and other products harmful to the ozone layer.
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