The Montreal Protocol on Substances that Deplete the Ozone Layer is an international treaty adopted in 1987 to protect the stratospheric ozone layer. It mandates the gradual phase-out of the production and consumption of ozone-depleting substances (ODS), such as chlorofluorocarbons (CFCs) and halons. It operates under the framework of the Vienna Convention for the Protection of the Ozone Layer.

• Bretton Woods Conference (1944): Led to the establishment of the International Monetary Fund (IMF) and the World Bank.
• Kyoto Protocol (1997): An international treaty aimed at reducing greenhouse gas emissions to combat global warming.
• Nagoya Protocol (2010): A supplementary agreement to the Convention on Biological Diversity (CBD) focusing on access to genetic resources and fair benefit-sharing.