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A carbon footprint expresses the greenhouse gases attributable to an activity in

  • A.tonnes of carbon dioxide equivalent
  • B.tonnes of carbon
  • C.tonnes of oil equivalent
  • D.cubic metres of gas at standard conditions

Answer: A

Each gas is multiplied by its global warming potential so that methane, nitrous oxide and the fluorinated gases can be added to carbon dioxide on one scale. Reporting in tonnes of carbon rather than of the dioxide understates the figure by a factor of 3.67.

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