Which of the following is the correct percentage of the two (out of the total of 4) greenhouse gases that contribute to the total global warming?

Options

A. `N_(2)O" "6%," "CO_(2)" "86%`
B. `"Methane "20%, N_(2)O" "18%`
C. `CFCs" "14%," methane "20%`
D. `CO_(2)" "40%," "CFCs" "30%`

Answer

To solve the question about the correct percentage of the two greenhouse gases that contribute to total global warming, we will follow these steps:

### Step 1: Identify the Greenhouse Gases
First, we need to identify the greenhouse gases mentioned in the question. The common greenhouse gases include:
- Carbon Dioxide (CO2)
- Methane (CH4)
- Nitrous Oxides (N2O)
- Chlorofluorocarbons (CFCs)

### Step 2: Understand Their Contribution to Global Warming
Next, we need to understand the contribution of each greenhouse gas to global warming. According to the provided information:
- Carbon Dioxide (CO2) contributes approximately 56%
- Methane (CH4) contributes approximately 20%
- Nitrous Oxides (N2O) contribute approximately 8%
- Chlorofluorocarbons (CFCs) contribute approximately 14%
- Water Vapor contributes approximately 2%

### Step 3: Analyze the Given Options
Now, let's analyze the options provided in the question:
1. Nitrous Oxides 6%, CO2 86%
2. Methane 20%, Nitrous Oxide 18%
3. CFCs 14%, Methane 20%
4. CO2 40%, CFCs 30%

### Step 4: Match the Options with the Contributions
We will match the options with the contributions we identified:
- Option 1: Nitrous Oxides 6% (incorrect) and CO2 86% (incorrect)
- Option 2: Methane 20% (correct) and Nitrous Oxide 18% (incorrect)
- Option 3: CFCs 14% (correct) and Methane 20% (correct)
- Option 4: CO2 40% (incorrect) and CFCs 30% (incorrect)

### Step 5: Conclusion
From our analysis, the correct option that lists the percentages of two greenhouse gases contributing to global warming is:
**CFCs 14% and Methane 20%**.

### Final Answer
The correct answer is **CFCs 14% and Methane 20%**.

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