By the 1990, people around the world became aware of the problem of the ozone layer. Human activity has damaged the ozone layer that protects us from the harmful UV radiations. The UN looked into this problem and in response, designed the Montreal Protocol.
The Montreal Protocol on Substances that Deplete the Ozone layer is an international treaty to protect the ozone layer. The treaty asked nations to phase out the production of many substances that would deplete the ozone layer.
The UN got the major industrialized nations to sign the treaty. The treaty was adopted in September, 1987 and came into force in September, 1989.
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