What is the correct chronological order, from older to newer, of the following agreement, summit and protocols?
1.Paris Agreement
2.Montreal Protocol
3.Kyoto Protocol
4.Rio Summit
A1, 2, 3, 4
B2, 4, 3, 1 ✓ Correct
C1, 3, 4, 2
D2, 3, 4, 1
Correct answer: (B) 2, 4, 3, 1
Explanation
From oldest to newest the sequence runs Montreal Protocol, Rio Summit, Kyoto Protocol, then Paris Agreement.
The Montreal Protocol came first in 1987 to protect the ozone layer.
The Rio Summit followed in 1992 with its Earth Summit agenda.
The Kyoto Protocol was adopted in 1997 with binding emission cuts.
The Paris Agreement arrived last in 2015 on nationally set pledges.
This gives the chronological order Montreal, then Rio, then Kyoto, then Paris.
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