What are the main sources of thermal pollution ?

Explanation

**Step-by-Step Text Solution:**

1. **Definition of Thermal Pollution**:
- Thermal pollution refers to the alteration of natural water bodies' temperature due to human activities, which can adversely affect aquatic ecosystems.

2. **Main Sources of Thermal Pollution**:
- The primary sources of thermal pollution are largely linked to industrial activities and energy production. Here are the key contributors:
- **Nuclear Power Plants**: These facilities use water for cooling purposes, and the heated water is often discharged back into natural water bodies, raising their temperature.
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