Montreal protocol on substances that deplete the ozone layer was signed in ........

Environment and Ecology Envirnment and Climate Change

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Montreal protocol on substances that deplete the ozone layer was signed in:

1978

1987

1991

1993

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Explanation:

he Montreal Protocol on Substances that Deplete the Ozone Layer (a protocol to the Vienna Convention for the Protection of the Ozone Layer) is an international treaty designed to protect the ozone layer by phasing out the production of numerous substances that are responsible for ozone depletion. It was agreed on 26 August 1987, and entered into force on 26 August 1989.