The Montreal Protocol on Substances That Deplete the Ozone Layer (usually called simply the Montreal Protocol) is the 1987 international treaty governing the use of chlorofluorocarbons (CFCs).  It was signed in January 1989 by most industrialized nations.
Montreal Protocol and its amendments control the phaseout of ozone-depleting substance (ODS) production and use. Under the protocol, several international organizations report on the science of ozone depletion, implement projects to help move away from ODS, and provide a forum for policy discussions. In addition, the Multilateral Fund provides resources to developing nations to promote the transition to "ozone-safe technologies".
The original document called for a 50-percent reduction in CFC use by 1992 relative to 1986 levels. The subsequent London Agreement called for a complete elimination of CFC use by 2000. The Copenhagen Agreement, which called for a complete phaseout by January 1, 1996, was implemented by the U.S. Environmental Protection Agency.