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UPCAT Science practice question 45: Which greenhouse gas is released in the greatest quantity by the burning of fossil fuels?

Correct answer

C. Carbon dioxide

Combustion of carbon-based fuels releases CO₂. Nitrogen and helium are not greenhouse gases, and ozone comes mainly from other processes.

Which greenhouse gas is released in the greatest quantity by the burning of fossil fuels?

  1. Ozone
  2. Nitrogen
  3. Carbon dioxideCorrect
  4. Helium

Why C is correct

Combustion of carbon-based fuels releases CO₂. Nitrogen and helium are not greenhouse gases, and ozone comes mainly from other processes.

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