A May 1985 report in the journal Nature was alarming. High above Antarctica, a massive hole had opened in the ozone shield that protects life on earth from the sun’s ultraviolet rays. The finding confirmed what scientists had warned of since the 1970s: Atmospheric ozone was being broken down by the wide use of chlorofluorocarbons, chemicals known as CFCs, which were found in aerosol sprays, refrigeration and air conditioning. Just over two years later, dozens of nations meeting in Montreal signed an agreement to significantly reduce CFCs, which the Environmental Protection Agency estimated would prevent 27 million deaths from skin cancers. “This is perhaps the most historically significant international environmental agreement,” Richard E. Benedick, the chief United States negotiator, said at the time.

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Persons: ” Richard E Organizations: Environmental Protection Agency Locations: Antarctica, Montreal, States