Which of the following statements are true in the context of methane?
1.Methane is a hydrocarbon that is a primary gas as well as a greenhouse gas
2.Methane is emitted from a variety of anthropogenic and natural sources
3.Methane is 25 times less potent than carbon dioxide at trapping heat
A1 and 2 ✓ Correct
B1 and 3
C1, 2 and 3
D2 and 3
Correct answer: (A) 1 and 2
Explanation
Only the first two statements are true, so the pair one and two is right.
Statement 1 is correct, as methane is a hydrocarbon that is both a primary gas and a greenhouse gas.
Statement 2 is correct, as it is emitted from many human-made and natural sources.
Statement 3 is wrong, since methane is far more potent than carbon dioxide at trapping heat, not less.
Over a century methane traps roughly 25 times as much heat as the same mass of carbon dioxide.
Its shorter atmospheric lifetime still makes cutting methane a quick climate win.
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