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Convention on Long-Range Transboundary Air Pollution (LRTAP), Geneva, 1979
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Environmental Protection: Aircraft Engine Emissions, Annex 16, vol. 2 to the Chicago Convention on International Civil Aviation, Montreal 1981
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Vienna Convention for the Protection of the Ozone Layer, Vienna, 1985
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Montreal Protocol on Substances that Deplete the Ozone Layer, Montreal 1987
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Framework Convention on Climate Change (UNFCCC), New York, 1992,
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Kyoto Protocol, 1997
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Paris Agreement, 2015
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Reduce carbon dioxide emissions to 50% of today emissions, 2025
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Airplane engine emissions reduced a minimum, USA 2030
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Ban of HCFCs in the entire world, by 2025, agreed in 2020