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What agreement called for countries to phase out many ozone-depleting chlorofluorocarbons?

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organohalogen compound Vinyl chloride is an organohalogen compound that has important industrial applications. When treated with certain catalysts, vinyl chloride monomers undergo polymerization and form the larger compound known as polyvinyl chloride, or PVC. PVC is used in the manufacture of numerous products, including packaging films and water pipes.

The international agreement that mandates the phase-out of ozone-depleting chlorofluorocarbons (CFCs) and other related substances is the Montreal Protocol on Substances That Deplete the Ozone Layer.12

Adopted in 1987, this landmark treaty was developed under the auspices of the United Nations Environment Programme in response to scientific evidence—notably research by F. Sherwood Rowland, Mario Molina, and Paul Crutzen—that these stable organohalogen compounds were causing the destruction of the ozone layer.12

By regulating the production and consumption of CFCs, halons, and other ozone-depleting chemicals, the protocol has been instrumental in the ongoing recovery of the Earth's protective ozone shield. The agreement includes differentiated phase-out schedules for developed and developing nations to account for varying technical and financial resources.1