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Arrange the following greenhouse gases in the increasing order of their life time in the earth's atmosphere:

1.SF6
2.N2O
3.H2O vapor
4.CH4
A3, 4, 2, 1 ✓ Correct
B3, 4, 1, 2
C1, 2, 3, 4
D2, 1, 4, 3
Correct answer: (A) 3, 4, 2, 1
Explanation

Ranked by how long they persist, water vapour is shortest, then methane, then nitrous oxide, and sulphur hexafluoride longest.

Water vapour cycles out of the air in days through rain and condensation.

Methane lasts about a decade before oxidising in the atmosphere.

Nitrous oxide stays for roughly a century.

Sulphur hexafluoride is extremely stable and lingers for thousands of years.

A long lifetime with strong heat trapping gives sulphur hexafluoride a very high global warming potential.

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