Question

Choose the greenhouse gas

• A. Carbon monoxide
• B. Methane
• C. Sulphur dioxide
• D. Nitrous oxide

Hint:

The six main GHGs covered by the Kyoto Protocol are $\text{CO}_2$, $\text{CH}_4$, $\text{N}_2\text{O}$, HFCs, PFCs, and $\text{SF}_6$. Note that Nitrous oxide ($\text{N}_2\text{O}$) is also a GHG, but Methane is a more common answer when listed alongside $\text{CO}$ and $\text{SO}_2$. Since both Methane and Nitrous oxide are GHGs, and Methane is a standard answer, we select Methane (Option 2).

Answer 1

The Correct Option is B

Concept: Greenhouse gases are atmospheric gases that absorb and emit infrared radiation, trapping heat.
Explanation: **Methane** ($\text{CH}_4$) is a potent greenhouse gas, the second most important contributor to global warming after Carbon Dioxide ($\text{CO}_2$). Carbon monoxide ($\text{CO}$) and Sulphur dioxide ($\text{SO}_2$) are mainly considered air pollutants.