Q. Which of the following are considered greenhouse gases (GHGs) in Earth’s atmosphere?
1.Carbon dioxide (CO₂)
2.Methane (CH₄)
3.Nitrous oxide (N₂O)
4.Ozone (O₃)
5.Water vapor (H₂O)
Select the correct answer using the code given below:

[A] 1, 2 and 3 only

[B] 1, 2, 3 and 4 only

[C] 2, 3, 4 and 5 only

[D] 1, 2, 3, 4 and 5

Answer: D
Notes:

Explanation:

  • Major greenhouse gases include carbon dioxide, methane, nitrous oxide, ozone, and water vapour, all of which trap heat in Earth’s lower atmosphere and contribute to the greenhouse effect.
  • While gases like nitrogen (N₂) and oxygen (O₂) dominate the atmosphere, they are not greenhouse gases since they do not absorb significant infrared radiation.

Source: Environment (Factly Forum IAS)

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