Which of the following is not a greenhouse gas?

A.Ozone

B. Nitrous oxide

C. Water vapor

D. Hydrogen

Option 3 is correct, i.e. Hydrogen.

• Gases that trap heat in the atmosphere are called greenhouse gases.

• Hydrogen gas is not a greenhouse gas. While hydrogen is abundant and involved in many atmospheric processes, it does not in itself absorb and emit radiant energy within the thermal infrared range, which is characteristic of greenhouse gases.

• On the other hand, Ozone (A), Nitrous oxide (B), and Water vapor (C) are all considered greenhouse gases because they can absorb and emit radiant energy within the thermal infrared range. This property causes the greenhouse effect, in which these gases capture heat in the Earth's atmosphere, leading to global warming.

Carbon dioxide (CO₂):

• It enters the atmosphere through burning fossil fuels solid waste, trees, and other biological materials.
• Carbon dioxide is removed from the atmosphere, when it is absorbed by plants as part of the biological carbon cycle.

Methane (CH₄):

• Methane is emitted during the production and transport of coal, natural gas, and oil.
• Methane emissions also result from livestock and other agricultural practices and by the decay of organic waste in municipal solid waste landfills.

Nitrous oxide (N₂O):

• Nitrous oxide is emitted during agricultural and industrial activities, combustion of fossil fuels and solid waste, as well as during the treatment of wastewater.
   

Fluorinated gases:

• Hydrofluorocarbons, perfluorocarbons, sulfur hexafluoride, and nitrogen trifluoride are synthetic, powerful greenhouse gases that are emitted from a variety of industrial processes.