What are the main sources of thermal pollution ?

Explanation

### Step-by-Step Solution:

**Step 1: Define Thermal Pollution**
- Thermal pollution refers to the increase or decrease in the temperature of natural water bodies (like rivers, lakes, and oceans) due to human activities. This change in temperature can be harmful to aquatic life and ecosystems.

**Step 2: Identify Major Sources of Thermal Pollution**
- The main sources of thermal pollution include:
1. **Nuclear Power Plants**: These facilities generate electricity through nuclear reactions, which produce a significant amount of heat. The excess heat is often released into nearby water bodies, raising their temperature.
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