The Montreal Protocol: triumph by treaty - UNEP
https://www.unep.org/news-and-stories/story/montreal-protocol-triumph-treaty
WEBNov 20, 2017 · The Montreal Protocol is the first and only treaty ever to have been ratified by every nation on Earth. This has happened not just once, but six times over, including the underlying framework convention, the protocol, and its four amendments. The ozone layer is healing, and is likely to recover in several decades.
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