Which of the following is NOT a "greenhouse gas" (GHG)?

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IB ACIO Grade-II Official Paper-I (Held On: 23 Sep, 2012)
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  1. Oxygen
  2. Carbon dioxide
  3. Water vapour
  4. Methane

Answer (Detailed Solution Below)

Option 1 : Oxygen
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IB ACIO Full Test 1
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Detailed Solution

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The correct answer is option 1 i.e. Oxygen

  • A Greenhouse gas (GHG) is a gas that absorbs and emits radiant energy within the thermal infrared range.
  • Carbon dioxidemethane, and water vapour are the most important greenhouse gases and oxygen is not a GHG. Hence option 1 is correct.
  • Some other gases such as surface-level ozone, nitrous oxides, and fluorinated gases also trap infrared radiation.
  • Kyoto Protocol
    • Kyoto Protocol is an international agreement that aimed to reduce Carbon dioxide emissions and the presence of Greenhouse Gases (GHG) in the atmosphere.
    • It was adopted in Kyoto, Japan on 11th December 1997. and became international law on 16 February 2005.

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