Discussion
The global warming potential of a gas expresses its warming effect relative to
Answer: B
Correct answer: carbon dioxide over a stated period
Global warming potential expresses the warming caused by a mass of gas relative to the same mass of carbon dioxide, integrated over a chosen horizon - conventionally a hundred years. Carbon dioxide is therefore 1 by definition, methane about 28 and nitrous oxide about 265. The horizon matters greatly for short-lived gases: methane’s potential over twenty years is nearer 84 than 28.
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