When was Montreal Protocol adopted?

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Multiple Choice

When was Montreal Protocol adopted?

Explanation:
The Montreal Protocol was adopted in 1987. It was hammered out at a meeting in Montreal and opened for signature on September 16, 1987, as a global response to the growing ozone depletion problem. It later entered into force in 1989 after enough countries ratified it. The other years refer to later amendments or earlier, unrelated events, so 1987 is the year the protocol was adopted.

The Montreal Protocol was adopted in 1987. It was hammered out at a meeting in Montreal and opened for signature on September 16, 1987, as a global response to the growing ozone depletion problem. It later entered into force in 1989 after enough countries ratified it. The other years refer to later amendments or earlier, unrelated events, so 1987 is the year the protocol was adopted.

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