Which of the following gases is NOT included in greenhouse gases?
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. Nitrogen.
Greenhouse gases (GHGs) trap heat in the Earth's atmosphere, contributing to global warming. Key GHGs include carbon dioxide (CO₂), methane (CH₄), and nitrous oxide (N₂O). However, nitrogen (N₂), which makes up about 78% of the atmosphere, is not a greenhouse gas because it does not absorb or emit infrared radiation. Unlike GHGs, nitrogen molecules are symmetric and non-polar, preventing them from effectively trapping heat. Thus, while nitrogen is essential for life, it does not contribute to the greenhouse effect. Nitrogen is not a greenhouse gas.