Greenhouse effect is due to

Options

A. accumulation of `O_(3)` and depletion of `CO_(2)`
B. accumulation of both `O_(3) " and " CO_(2)`
C. accumulation of `CO_(2)` and depletion of `O_(3)`
D. presence of green plants on the Earth.

Answer

### Step-by-Step Solution:

1. **Understanding the Greenhouse Effect**:
- The greenhouse effect refers to the warming of the Earth's surface due to the presence of certain gases in the atmosphere. These gases trap heat from the sun, preventing it from escaping back into space.

2. **Identifying Greenhouse Gases**:
- Common greenhouse gases include carbon dioxide (CO2), methane (CH4), nitrous oxide (N2O), and chlorofluorocarbons (CFCs). Among these, CO2 is a significant contributor to the greenhouse effect.

3. **Sources of Carbon Dioxide**:
- CO2 is primarily produced through the combustion of fossil fuels (like coal, oil, and natural gas), deforestation, and various industrial processes. The accumulation of CO2 in the atmosphere enhances the greenhouse effect.

4. **Role of Ozone**:
- Ozone (O3) is found in the stratosphere and plays a crucial role in protecting the Earth from harmful ultraviolet (UV) radiation. However, the depletion of the ozone layer is a separate environmental issue that can occur due to certain pollutants, including chlorofluorocarbons.

5. **Analyzing the Options**:
- Option A: Accumulation of O3 and depletion of CO2 - Incorrect, as CO2 is the gas that contributes to the greenhouse effect.
- Option B: Accumulation of both O3 and CO2 - Incorrect, as O3 does not contribute to the greenhouse effect in the same way CO2 does.
- Option C: Accumulation of CO2 and depletion of O3 - Correct, as CO2 accumulation leads to the greenhouse effect, and ozone depletion is a related environmental concern.
- Option D: Presence of green plants on Earth - Incorrect, as while plants do absorb CO2, they are not a direct cause of the greenhouse effect.

6. **Conclusion**:
- The greenhouse effect is primarily due to the accumulation of carbon dioxide (CO2) in the atmosphere and is associated with the depletion of ozone (O3). Therefore, the correct answer is **Option C: Accumulation of CO2 and depletion of O3**.