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When did the Montreal Protocol entered into force?

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When did the Montreal Protocol entered into force?

(a) 1984

(b) 1986

(c) 1989

(d) 1994

This question was addressed to me during an interview for a job.

I need to ask this question from Kyoto Protocol and Montreal Protocol topic in chapter Social Issues and the Environment of Energy Management

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The correct option is (c) 1989

For explanation: The Montreal Protocol is an international treaty on substances that depleting the ozone layer and it is designed to protect the ozone layer. The Montreal Protocol was agreed on 16 September 187 and entered into force on 1 January 1989.

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