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The Montreal Protocol to control ozone-depleting substances was signed in:

A2002
B1987
C1974
D1992
Answer & Solution
Correct answer: B. 1987
1. It became effective in 1989. 2. It was signed at Montreal in 1987. 3. CFCs are the main ozone depleters. _Source: syllabus Biology, Chapter 16, Environmental Issues._
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