Gases that trap heat in the atmosphere and cause global warming are called greenhouse gases. Which of the following combinations are not included under the greenhouse gases?

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OPSC OAS 2023 Prelims (General Studies) Official Paper-I
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  1. Carbon dioxide, Methane
  2. Nitrous oxide, Hydrofluorocarbons
  3. Carbon monoxide, Sulphur dioxide
  4. Carbon dioxide, water vapour

Answer (Detailed Solution Below)

Option 3 : Carbon monoxide, Sulphur dioxide
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ST 1: General Studies (Indian Polity - I)
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Detailed Solution

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The Correct answer is Option 3. 

Key Points

  • Carbon dioxide, Methane (1):  Both are recognized as greenhouse gases that contribute to global warming. Carbon dioxide is a major greenhouse gas emitted through human activities, while methane is significantly more effective at trapping heat in the atmosphere.  Included under greenhouse gases.
  • Nitrous oxide, Hydrofluorocarbons (2):  Nitrous oxide is a potent greenhouse gas, and hydrofluorocarbons (HFCs) are synthetic gases used in refrigeration and air conditioning that also contribute to global warming.  Included under greenhouse gases.
  • Carbon monoxide, Sulphur dioxide (3):  Carbon monoxide is not a greenhouse gas; it is a pollutant that can affect air quality and human health. Sulphur dioxide, while a significant pollutant, is also not classified as a greenhouse gas; it contributes to acid rain and has a cooling effect on the atmosphere by forming sulfate aerosols. Not included under greenhouse gases.
  • Carbon dioxide, water vapour (4): Carbon dioxide is a greenhouse gas, and water vapor is also considered a greenhouse gas as it contributes to the greenhouse effect. Included under greenhouse gases.
  • The combination that is not included under greenhouse gases is Option 3: Carbon monoxide, Sulphur dioxide.
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