Question

Which among the following is the most dangerous green house gas?

• A. Carbon dioxide
• B. Methane
• C. Nitrous Oxide
• D. Chloro-floro carbons

Hint:

CFCs = Highest global warming potential + Ozone depletion

Answer 1

The Correct Option is D

Concept:
Greenhouse gases trap heat in the Earth's atmosphere. Their impact depends on their global warming potential (GWP) and persistence in the atmosphere.

Step 1: Carbon dioxide (CO\textsubscript{2})

• Most abundant greenhouse gas.
• Lower warming potential compared to others.

Step 2: Methane (CH\textsubscript{4})

• Higher warming potential than CO\textsubscript{2}.
• Shorter atmospheric lifetime.

Step 3: Nitrous Oxide (N\textsubscript{2}O)

• Strong greenhouse gas.
• Long atmospheric life.

Step 4: Chloro-fluoro carbons (CFCs)

• Extremely high global warming potential.
• Also responsible for ozone layer depletion.
• Persist in atmosphere for long durations.

Step 5: Comparative Analysis

• CFCs have the highest impact per molecule.
• Hence, considered most dangerous. Final Conclusion: \[ \boxed{\text{Chloro-fluoro carbons}} \]