Multiple choice

Which of the following is not a major greenhouse gas?

  1. Methane

  2. Ozone

  3. Carbon Dioxide

  4. Water vapour

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Ozone is not a major greenhouse gas.  Quantifying the greenhouse gas potency of ozone is difficult because it is not present in uniform concentrations across the globe. However, the most widely accepted scientific assessments relating to climate change suggest that the radiative forcing of troposphere ozone is about 25% that of carbon dioxide.