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ozone-hole
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Chlorofluorocarbons release chlorine that destroys ozone catalytically, especially on polar stratospheric clouds. The science led to a treaty within two years of the Antarctic hole's discovery, and the ozone layer is on track to recover by around 2066 over Antarctica. It is the clearest case of a global environmental problem closed by science followed by policy.
Evidence tier V3 is the import default for a result the curation records as settled in the published record. No formal proof or certificate is attached to this page yet.
Closed 1974 mechanism, Molina and Rowland; 1985 detection, Farman, Gardiner and Shanklin; 1987 Montreal Protocol.