Excessive release of `CO_(2)` into the atmosphere result in :

Options

A. Global warming
B. Formation of smog
C. Polar vortex
D. Depletion of ozone

Explanation

To solve the question regarding the excessive release of CO2 into the atmosphere, we will analyze the options provided and determine the correct consequence of increased CO2 levels.

### Step-by-Step Solution:

1. **Understanding CO2 and its Role**:
- Carbon dioxide (CO2) is a greenhouse gas that contributes to the greenhouse effect. It traps heat in the atmosphere, which is essential for maintaining the Earth's temperature.

**Hint**: Remember that greenhouse gases like CO2 play a crucial role in regulating Earth's temperature.

2. **Analyzing the Options**:
- **Option A: Global warming**: This refers to the increase in Earth's average surface temperature due to rising levels of greenhouse gases, including CO2.
- **Option B: Formation of smoke**: Smoke is primarily formed from combustion processes and involves other pollutants like carbon monoxide (CO) and nitrogen oxides (NOx), not directly from CO2.
- **Option C: Polar vortex**: This is a meteorological phenomenon related to cold air in the polar regions and is not directly influenced by CO2 levels.
- **Option D: Depletion of ozone**: The depletion of the ozone layer is mainly caused by chlorofluorocarbons (CFCs) and not by CO2.

**Hint**: Evaluate each option based on how directly they relate to CO2 emissions.

3. **Eliminating Incorrect Options**:
- **Option B** (formation of smoke) is incorrect because CO2 does not contribute to smoke formation.
- **Option C** (polar vortex) is also incorrect as it is unrelated to CO2 levels.
- **Option D** (depletion of ozone) is incorrect since ozone depletion is caused by CFCs, not CO2.

**Hint**: Focus on the direct effects of CO2 rather than unrelated phenomena.

4. **Identifying the Correct Answer**:
- **Option A (Global warming)** is the only option that accurately describes a consequence of excessive CO2 release. Increased CO2 levels lead to more heat being trapped in the atmosphere, resulting in global warming.

**Hint**: Global warming is a well-established consequence of increased greenhouse gases, including CO2.

5. **Conclusion**:
- The excessive release of CO2 into the atmosphere results in global warming, making **Option A** the correct answer.

### Final Answer:
**A: Global warming**