![]() ![]() ![]() ![]() The resulting Montreal Protocol, the only United Nations treaty ratified by every country in the world, was signed in 1987 and entered into effect in 1989, when little was known about its impact on the global climate. New York, NY-May 22, 2023-When scientists discovered a hole over Antarctica in 1985, countries across the globe got together and wrote a treaty designed to protect the ozone layer, which shields the Earth-and us-from harmful levels of ultraviolet radiation. Credit: Royalty-free arctic photos free download | Pxfuel ![]()
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