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Arrange the following greenhouse gases in the increasing order of their Global Warming Potential (GWP) :

  • A.\(\mathrm{N_{2}O} \lt \mathrm{SF_{6}} \lt \mathrm{CH_{4}}\)
  • B.\(\mathrm{SF_{6}} \lt \mathrm{N_{2}O} \lt \mathrm{CH_{4}}\)
  • C.\(\mathrm{CH_{4}} \lt \mathrm{N_{2}O} \lt \mathrm{SF_{6}}\)
  • D.\(\mathrm{SF_{6}} \lt \mathrm{CH_{4}} \lt \mathrm{N_{2}O}\)

Answer: C

The increasing order is CH4 < N2O < SF6.

Global warming potential compares the warming caused by a gas over a set period, usually 100 years, with that of the same mass of carbon dioxide. On the IPCC figures:

  • methane: about 25 to 28
  • nitrous oxide: about 265 to 298
  • sulphur hexafluoride: about 23,000

SF6 is the most potent greenhouse gas assessed by the IPCC, so any order that puts it first is wrong. The option ending in methane reverses the order of the other two as well.

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