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Asked in PPSC, FPSC and other one-paper exams (compiled from unofficial resources).

Environment, Weather & EcologyGreenhouse Effect and Global Warming

Which greenhouse gas is considered to be 25 times more potent than carbon dioxide (CO2) in terms of its impact on global warming?

  1. A.Nitrous oxide (N2O)
  2. B.Water vapor (H2O)
  3. C.Methane (CH4)Correct answer
  4. D.Ozone (O3)

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Quick fact: Methane (CH4) is considered to be 25 times more potent than carbon dioxide (CO2) in terms of its global warming potential over a 100-year period.

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