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Which emissions benefit does natural gas offer?

  • A.No emissions at all, since methane burns completely and therefore produces nothing beyond water vapour
  • B.Nothing
  • C.A better hydrogen to carbon ratio than petrol, so less carbon dioxide is produced for the same energy released
  • D.Lower carbon dioxide per unit of energy

Answer: D

Methane has the best hydrogen to carbon ratio of any hydrocarbon. The last option explains exactly that advantage, which makes it a correct and more instructive version. It still produces carbon dioxide. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. The shared behaviour explains why these belong together and the differences explain why both exist. Reading the definition literally, rather than recalling a formula, is the reliable route through questions of this shape.

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