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Montreal Protocol

environmental protocol designed to protect the ozone layer

en-US/ˌmɑntɹiˈɑl ˈpɹoʊtəˌkɑl/
en-GB/ˌmɒntɹɪˈɔːl ˈpɹəʊtəˌkɒl/

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treatyenvironmental protocol