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 "After carbon dioxide, the gas which contributes maximum to global warming is," we can follow these steps:

### Step 1: Understand Global Warming
Global warming refers to the increase in Earth's average surface temperature due to rising levels of greenhouse gases in the atmosphere. These gases trap heat and contribute to the greenhouse effect.

**Hint:** Remember that global warming is primarily caused by greenhouse gases.

### Step 2: Identify Greenhouse Gases
The main greenhouse gases that contribute to global warming include:
- Carbon Dioxide (CO2)
- Methane (CH4)
- Chlorofluorocarbons (CFCs)
- Nitrous Oxide (N2O)

**Hint:** List the common greenhouse gases to understand their contributions.

### Step 3: Analyze Contribution Percentages
According to the information provided:
- Carbon Dioxide (CO2) contributes approximately 60% to global warming.
- Methane (CH4) contributes about 20%.
- Chlorofluorocarbons (CFCs) contribute around 14%.
- Nitrous Oxide (N2O) contributes about 6%.

**Hint:** Focus on the percentages to determine which gas follows CO2 in terms of contribution.

### Step 4: Determine the Gas with Maximum Contribution After CO2
From the percentages:
- After CO2 (60%), the next highest contributor is Methane (20%).

**Hint:** Compare the percentages of each gas to find the second highest.

### Conclusion
The gas that contributes the maximum to global warming after carbon dioxide is Methane (CH4).

**Final Answer:** Methane (CH4)