× Information on this section of ECOLEX comes from the InforMEA Portal which compiled information from MEA Secretariats with the support of the European Union. The accuracy of the information displayed is the responsibility of the originating data source. In case of discrepancy the information as displayed on the respective MEA website prevails. Decision XI/11: Ratification of the Vienna Convention, the Montreal Protocol, and the London, Copenhagen and Montreal Amendments Document type Decision Reference number XI/11 Date Nov 29, 1999 SourceUNEP, InforMEA Status Active Subject Waste & hazardous substances, Air & atmosphere Treaty Montreal Protocol on Substances that Deplete the Ozone Layer (Sep 16, 1987) Meeting Website ozone.unep.org Abstract The Eleventh Meeting of the Parties decided in Dec. XI/11: To note with satisfaction the large number of countries that have ratified the Vienna Convention for the Protection of the Ozone Layer and the Montreal Protocol on Substances that Deplete the Ozone Layer; To note that 136 Parties have ratified the London Amendment to the Montreal Protocol, while only 101 Parties have ratified the Copenhagen Amendment to the Montreal Protocol and only 29 Parties have ratified the Montreal Amendment to the Montreal Protocol as of 15 November 1999; To urge all States that have not yet done so to ratify, approve or accede to the Vienna Convention and the Montreal Protocol and its Amendments, taking into account that universal participation is necessary to ensure the protection of the ozone layer.