Discussion
Methane has a hundred year global warming potential of \( 28 \). An emission of \( 1500 \) tonnes is equivalent to
Answer: D
Correct answer: 42000 tonnes of carbon dioxide
Multiply the emission by the global warming potential:
\[ 1500 \times 28 = 42\,000\ \mathrm{tonnes\ CO_2\ equivalent} \]
The distractor \( 53.6 \) divides instead of multiplying. The hundred-year potential of 28 reflects methane being a far stronger absorber than carbon dioxide but much shorter-lived, which is why its twenty-year potential is around 80 - the choice of time horizon materially changes how a methane reduction is valued against a carbon dioxide one.
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