Which of the following contributes to both global warming and ozone thinning?

Options

A. Carbon dioxide
B. Nitrous oxide
C. Methane
D. CFCs

Answer

To solve the question "Which of the following contributes to both global warming and ozone thinning?", we can follow these steps:

### Step 1: Understand the Concepts
- **Global Warming**: This refers to the increase in Earth's average surface temperature due to rising levels of greenhouse gases, primarily carbon dioxide (CO2), methane (CH4), and nitrous oxide (N2O).
- **Ozone Thinning**: This refers to the depletion of the ozone layer in the stratosphere, primarily caused by certain chemicals, notably chlorofluorocarbons (CFCs).

### Step 2: Analyze the Compounds
- **Carbon Dioxide (CO2)**: Primarily contributes to global warming but does not affect ozone thinning.
- **Nitrous Oxide (N2O)**: Contributes to global warming and causes acid rain, but it does not significantly contribute to ozone thinning.
- **Methane (CH4)**: Mainly associated with air pollution and global warming, but it does not contribute to ozone thinning.
- **Chlorofluorocarbons (CFCs)**: These compounds are known to contribute to both global warming and ozone thinning. They react with ozone in the stratosphere and deplete the ozone layer while also being greenhouse gases.

### Step 3: Identify the Correct Answer
Based on the analysis, the compound that contributes to both global warming and ozone thinning is **Chlorofluorocarbons (CFCs)**.

### Final Answer
The correct answer is **CFCs (Chlorofluorocarbons)**.

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