Question

Which among the following is a greenhouse gas?

• A. Methane
• B. Oxygen
• C. Nitrogen
• D. Hydrogen

Hint:

Remember the key greenhouse gases: CO₂, CH₄, N₂O, O₃, and water vapor. These gases trap heat and influence Earth's climate.

Answer 1

The Correct Option is A

Step 1: Understanding greenhouse gases.
Greenhouse gases are those that trap heat in the Earth's atmosphere and contribute to the greenhouse effect, causing global warming and climate change.

Step 2: Evaluating the options.
- **Methane (CH₄)**: A potent greenhouse gas, far stronger than CO₂ in trapping heat.
- **Oxygen (O₂)**: Essential for respiration but not a greenhouse gas.
- **Nitrogen (N₂)**: Makes up the majority of air but is inert and not a greenhouse gas.
- **Hydrogen (H₂)**: A light gas, not a greenhouse gas.

Step 3: Conclusion.
Hence, the correct answer is Methane.

Final Answer: \[ \boxed{\text{Methane is the greenhouse gas.}} \]