Discussion
Which among the following gases has the highest global warming potential?
Answer: D
The gas with the highest global warming potential is N2O.
Global warming potential (GWP) compares the warming caused by a mass of gas over a time horizon, usually 100 years, with the same mass of CO2, which is defined as 1. Over 100 years, nitrous oxide has a GWP of roughly 270 to 300 because it absorbs strongly and lasts more than a century in the atmosphere. Methane's GWP is about 28 to 30: it absorbs strongly but survives only around a decade.
CO2 is the reference, GWP 1. Water vapour is not usually assigned a GWP, because its concentration is set by temperature and it stays in the air only days; it acts as a feedback rather than a forcing.
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