After carbon dioxide, the gas which contributes maximum to global warming is

Options

A. Chlorofluorocarbons `(25%)`
B. Methane `(20%)`
C. Chlorofluorocarbons `(20%)`
D. Methane `(45%)`

Answer

To solve the question regarding which gas contributes the most to global warming after carbon dioxide, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Global Warming**:
- Global warming refers to the increase in Earth's average surface temperature due to rising levels of greenhouse gases in the atmosphere.

2. **Identifying Greenhouse Gases**:
- The primary greenhouse gases include carbon dioxide (CO2), methane (CH4), nitrous oxide (N2O), and chlorofluorocarbons (CFCs).

3. **Analyzing the Contribution of Each Gas**:
- According to the information provided, carbon dioxide contributes approximately 60% to global warming.
- Methane contributes about 20%.
- Chlorofluorocarbons (CFCs) contribute around 14%.
- Nitrous oxide contributes about 6%.

4. **Comparing the Options**:
- The options given in the question are:
A. Chlorofluorocarbon 25%
B. Methane 20%
C. Chlorofluorocarbon 20%
D. Methane 45%
- From our analysis, we see that methane (20%) is the correct contribution after carbon dioxide (60%).

5. **Conclusion**:
- Therefore, the gas that contributes the maximum to global warming after carbon dioxide is **B. Methane (20%)**.