GATE 2023 ES – Question 23
Order oldest to newest:i Stockholm UN environment conference establishing UNEP;ii Vienna ozone convention;iii Glasgow COP26;iv Montreal ozone protocol.
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Correct answer: (A) i, ii, iv, iii
Explanation
The dates are Stockholm1972,Vienna1985,Montreal1987,and Glasgow COP26 in 2021. Chronological order is therefore **i, ii, iv, iii;A**. The Montreal Protocol followed the framework Vienna Convention.