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When did the Montreal protocol come into force?

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When did the Montreal protocol come into force?

(a) 1985

(b) 1987

(c) 1989

(d) 1991

This question was posed to me in an online quiz.

My question is based upon Major International Environmental Protocols topic in division International Conventions and Protocols of Energy Management

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Correct option is (c) 1989

Explanation: Montreal protocol on substances that deplete ozone layer came into force in 1989. The protocol settargete for reducing the consumption and production of a range of ozone depleting substances.

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