Excess atmosperic `CO_(2)` increases greenhouse effect as it:

Options

A. Is opaque to infra-red rays
B. is not opaque to infra-red rays
C. Precipitates dust in the atmosphere
D. Reduces atmospheric pressure.

Answer

**Step-by-Step Solution:**

1. **Understanding Greenhouse Gases**: Begin by recognizing what greenhouse gases are. Greenhouse gases, such as carbon dioxide (CO₂), trap heat in the atmosphere, contributing to the greenhouse effect.

2. **Role of CO₂ in the Atmosphere**: Acknowledge that CO₂ is a significant greenhouse gas. Its concentration in the atmosphere has increased due to human activities, such as burning fossil fuels and deforestation.

3. **Absorption of Infrared Radiation**: Explain that CO₂ molecules have specific chemical bonds that allow them to absorb long-wavelength infrared radiation emitted from the Earth's surface. This absorption is a key factor in the greenhouse effect.

4. **Opaque to Infrared Rays**: Clarify that when we say CO₂ is "opaque to infrared rays," it means that these rays cannot easily pass through CO₂ molecules. Instead, the energy from these rays is absorbed, preventing heat from escaping back into space.

5. **Conclusion**: Conclude that the correct answer to the question is that excess atmospheric CO₂ increases the greenhouse effect because it is opaque to infrared rays.

**Final Answer**: Excess atmospheric CO₂ increases the greenhouse effect as it is opaque to infrared rays.

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