Contribution of `CO_2 and CH_4` in the greenhouse effect is respectively .

Options

A. `CO_2 60% , CH_4 20 %`
B. `CO_2 20% , CH_4 60 %`
C. `CO_2 80% , CH_4 20 %`
D. `CO_2 70% , CH_4 30 %`

Answer

To solve the question regarding the contribution of CO₂ (carbon dioxide) and CH₄ (methane) in the greenhouse effect, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Greenhouse Effect**:
- The greenhouse effect is a natural process that warms the Earth’s surface. It occurs when the sun's energy reaches the Earth and is reflected back to space. Greenhouse gases trap some of this energy in the atmosphere, which keeps the planet warm.

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

3. **Determine Contributions**:
- According to the information provided, the contributions of these gases to the greenhouse effect are:
- Carbon Dioxide (CO₂): 60%
- Methane (CH₄): 20%
- Chlorofluorocarbons (CFCs): 14%
- Nitrous Oxide (N₂O): 6%

4. **Analyze the Options**:
- The question provides multiple-choice options regarding the contributions of CO₂ and CH₄:
- Option 1: CO₂ is 60% and CH₄ is 20%
- Option 2: CO₂ is 20% and CH₄ is 60%
- Option 3: CO₂ is 20% and CH₄ is 20%
- Option 4: CO₂ is 70% and CH₄ is 30%

5. **Select the Correct Option**:
- From the contributions identified, the correct option is:
- **Option 1: CO₂ is 60% and CH₄ is 20%**.

### Final Answer:
The contribution of CO₂ and CH₄ in the greenhouse effect is respectively **60% and 20%**.

---