Combustion of fossil fuels generates a lot of air pollution. Can you suggest any two alternative sources of energy which do not cause any pollution?

Explanation

### Step-by-Step Solution:

1. **Understanding the Problem**: The question asks for alternative sources of energy that do not cause air pollution, especially in the context of the pollution caused by the combustion of fossil fuels.

2. **Identifying the Issue**: Combustion of fossil fuels releases harmful gases such as carbon monoxide, carbon dioxide, and sulfur dioxide, which contribute to air pollution.

3. **Exploring Alternative Energy Sources**: We need to find energy sources that do not produce these harmful emissions when used.

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