Arrange the following greenhouse gases in decreasing order of their contribution to total global warming.
A. Nitrous oxide
B. Carbon dioxide
C. Chlorofluoro carbon
D. Methane
A. Nitrous oxide
B. Carbon dioxide
C. Chlorofluoro carbon
D. Methane
Show Hint
- C, A, B, D
- A, C, B, D
- A, B, C, D
- B, D, A, C
The Correct Option is D
Solution and Explanation
Step 1: Understand "contribution to global warming".
This contribution depends on two factors: the gas's atmospheric concentration and its global warming potential (GWP) per molecule. The overall effect is the product of these factors.
Step 2: Rank the gases by their overall contribution. 1. Carbon Dioxide (CO\(_2\)): Although it has the lowest GWP of the main greenhouse gases (by definition, GWP=1), its atmospheric concentration is vastly higher than the others, making it the largest contributor to modern global warming (typically over 60%). 2. Methane (CH\(_4\)): It has a much higher GWP than CO\(_2\) but a lower concentration. It is the second-largest contributor. 3. Nitrous Oxide (N\(_2\)O): It has a very high GWP and a longer atmospheric lifetime than methane, but its concentration is lower, making it the third-largest contributor. 4. Chlorofluorocarbons (CFCs) and other halocarbons: They have extremely high GWPs but are present in very small concentrations. Their contribution is smaller than the others listed.
Step 3: Form the sequence. The order in decreasing contribution is: B (Carbon dioxide) \(\rightarrow\) D (Methane) \(\rightarrow\) A (Nitrous oxide) \(\rightarrow\) C (Chlorofluorocarbon). The sequence is B, D, A, C.
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