Question

Pick the odd one out with respect to greenhouse gases

• A. Oxygen
• B. CFCs
• C. Carbon dioxide
• D. Methane

Answer 1

The correct option is A Oxygen

Earth's greenhouse gases trap heat in the atmosphere and warm the planet. A greenhouse gas is a gas that absorbs and emits radiant energy within the thermal infrared range, causing the greenhouse effect.

The primary greenhouse gases in Earth's atmosphere are $C{O}_2$, $C{H}_4$, $N_{2}O$ and CFCs (chlorofluorocarbons).

Carbon dioxide (60%) contributes maximum to the greenhouse effect on Earth. Methane (20%), nitrous oxide (6%), chlorofluorocarbons (14%) are also potent greenhouse gases, but their contribution to global warming is less compared to carbon dioxide.

Oxygen is not a greenhouse gas, because it is transparent to infrared light.