`CO_(2)` is called a green house gas because

Options

A. it is transparent to sunlight but opaque to heat
B. transparent to light & heat radiation & both
C. transparent to light & heat radiation both to sunlight
D. used in green houses to increase plant growth

Answer

To answer the question "CO₂ is called a greenhouse gas because," we can break down the explanation into several steps:

### Step-by-Step Solution:

1. **Definition of Greenhouse Gas**:
- Greenhouse gases are substances in the atmosphere that can trap heat. They allow sunlight to enter the atmosphere but prevent some of the heat that the sunlight brings from leaving the atmosphere.

2. **Role of CO₂**:
- Carbon dioxide (CO₂) is one of the primary greenhouse gases. It plays a significant role in the greenhouse effect, which is the warming of the Earth’s surface.

3. **Transparency to Sunlight**:
- CO₂ is transparent to sunlight. This means that sunlight can pass through CO₂ and reach the Earth’s surface.

4. **Opacity to Heat**:
- Once sunlight reaches the Earth's surface, it is converted into heat. CO₂ is opaque to this heat, meaning it traps the heat in the atmosphere rather than allowing it to escape back into space.

5. **Conclusion**:
- Therefore, CO₂ is called a greenhouse gas because it is transparent to sunlight but opaque to heat, effectively trapping heat in the atmosphere and contributing to the greenhouse effect.

### Final Answer:
CO₂ is called a greenhouse gas because it is transparent to sunlight but opaque to heat.

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