Which is not correct about greenhouse effect ?

Options

A. It results in global warming
B. Carbon dioxide is one of the main chemical species responsible for it.
C. It results in lowering of ocean water over the years
D. `CH_(4)CO_(3),CFC` also contribute to greenhouse effect.

Answer

To solve the question "Which is not correct about greenhouse effect?", we will analyze each of the provided statements regarding the greenhouse effect and identify the incorrect one.

### Step-by-step Solution:

1. **Understand the Greenhouse Effect**:
- The greenhouse effect is the process by which certain gases in Earth's atmosphere trap heat, preventing it from escaping back into space. This leads to an increase in the planet's temperature.

2. **Identify Greenhouse Gases**:
- Common greenhouse gases include carbon dioxide (CO2), methane (CH4), water vapor, and chlorofluorocarbons (CFCs). These gases absorb and emit infrared radiation, contributing to the greenhouse effect.

3. **Evaluate the Statements**:
- **Statement 1**: "It results in global warming."
- This statement is correct. The greenhouse effect is a significant contributor to global warming.

- **Statement 2**: "Carbon dioxide is one of the main chemical species responsible for it."
- This statement is also correct. CO2 is a major greenhouse gas and plays a crucial role in the greenhouse effect.

- **Statement 3**: "It results in lowering of ocean water over the years."
- This statement is incorrect. The greenhouse effect leads to global warming, which causes polar ice to melt and contributes to rising sea levels, not lowering them.

- **Statement 4**: "CH4, CFC also contribute to greenhouse gases."
- This statement is correct. Methane (CH4) and chlorofluorocarbons (CFCs) are indeed greenhouse gases that contribute to the greenhouse effect.

4. **Conclusion**:
- The incorrect statement among the options provided is **Statement 3**, which claims that the greenhouse effect results in lowering ocean water levels. In reality, it results in rising ocean water levels due to melting ice caps and thermal expansion of water.

### Final Answer:
The statement that is not correct about the greenhouse effect is: **"It results in lowering of ocean water over the years."**

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