Question

What is the primary greenhouse gas responsible for the natural greenhouse effect?

• A. Carbon dioxide
• B. Methane
• C. Water vapour
• D. Nitrous oxide

Hint:

\textbf{Natural greenhouse effect:} Dominated by \textbf{water vapour}.
\textbf{Human-induced warming:} Mainly due to \(CO_2\).

Answer 1

The Correct Option is C

Concept: Greenhouse gases trap heat in the Earth's atmosphere and maintain the planet's temperature. Different gases contribute differently to the natural greenhouse effect.
Step 1: Understanding greenhouse gases.
Major greenhouse gases include water vapour, carbon dioxide, methane, and nitrous oxide.
Step 2: Identifying the primary contributor.
Water vapour is the most abundant greenhouse gas and contributes the largest share to the natural greenhouse effect.
Step 3: Eliminating incorrect options.

• Carbon dioxide is important but not the largest contributor.
• Methane and nitrous oxide are present in smaller amounts.

Conclusion:
Thus, the correct answer is Water vapour.