Question

Which of the following is not a green-house gas?

• A. Water vapour
• B. Carbon dioxide
• C. Methane
• D. Oxygen

Answer 1

The correct option is D Oxygen

A greenhouse gas is any gaseous compound in the atmosphere that is capable of absorbing infrared radiation, thereby trapping and holding heat in the atmosphere. By increasing the heat in the atmosphere, greenhouse gases are responsible for the greenhouse effect, which ultimately leads to global warming. The most significant greenhouse gases are water vapor ($H_{2}O$), carbon dioxide ($C{O}_2$), methane ($C{H}_4$) and nitrous oxide ($N_{2}O$), according to the Environmental Protection Agency (EPA).

But oxygen is not capable to absorb infrared radiation and thus do not cause green house effect. Therefore, the correct answer is option D.