Arrange CFC, `CH_(4), N_(2) O and CO_(2)` in decreasing order according to their contribution in green house effect

Options

A. `CO_(2) gt N_(2) O gt CFC gt CH_(4)`
B. `CFC gt CO_(2) CH_(4) gt N_(2)O`
C. `CH_(4) gt CFCgt N_(2) O gt CO_(2)`
D. `CO_(2) gt CH_(4) gt CFC gt N_(2) O`

Answer

To arrange the gases CFC, CH₄, N₂O, and CO₂ in decreasing order according to their contribution to the greenhouse effect, we need to consider their Global Warming Potential (GWP). The GWP indicates how much heat a greenhouse gas traps in the atmosphere compared to carbon dioxide (CO₂), which is the reference gas.

### Step-by-Step Solution:

1. **Understand Global Warming Potential (GWP)**:
- GWP measures how much heat a greenhouse gas traps in the atmosphere relative to CO₂ over a specific time period. CO₂ is assigned a GWP of 1.

2. **Identify the GWP values for each gas**:
- CO₂ (Carbon Dioxide): GWP = 1 (baseline)
- CH₄ (Methane): GWP = 25 (it traps 25 times more heat than CO₂)
- N₂O (Nitrous Oxide): GWP = 298 (it traps 298 times more heat than CO₂)
- CFC (Chlorofluorocarbon): GWP varies by type, but for common CFCs, it can be around 1000 or more.

3. **Rank the gases based on their GWP**:
- Highest GWP: CFC (1000+)
- Next: N₂O (298)
- Then: CH₄ (25)
- Lowest: CO₂ (1)

4. **Arrange in decreasing order**:
- CFC > N₂O > CH₄ > CO₂

5. **Final Arrangement**:
- The final order from highest to lowest contribution to the greenhouse effect is:
- CFC
- N₂O
- CH₄
- CO₂

### Conclusion:
The correct order of gases in decreasing contribution to the greenhouse effect is:
1. CFC
2. N₂O
3. CH₄
4. CO₂