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The Montreal Protocol, aimed at limiting the emission of substances harmful to the ozone layer, was first signed in 1987 and later revised significantly in 1990 and 1992.

1. This statement is false.
2. This statement is inaccurate.
3. This statement is incorrect.
4. This statement is true.

Correct answer: This statement is true.

Solution

The Montreal Protocol is a well-documented international treaty aimed at reducing the release of ozone-depleting substances. It was indeed signed in 1987 and later amended in 1990 and 1992, making option (d) correct.

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