What are the major causes of eutrophication?

Explanation

**Step-by-Step Solution:**

1. **Understanding Eutrophication**: Eutrophication is the process where water bodies become enriched with nutrients, leading to excessive growth of algae and a decline in species diversity. This often results in a decrease in oxygen levels, which can harm aquatic life.

2. **Identifying Major Causes**:
- **Household Detergents**: Many household cleaning products contain phosphates and nitrates, which can wash into rivers and lakes. These nutrients promote algal blooms, which deplete oxygen in the water.
- **Industrial Waste**: Factories often discharge waste that is rich in nutrients into nearby water bodies. This can include fertilizers and other chemicals that contribute to nutrient overload.
- **Sewage**: Untreated or poorly treated sewage is a significant source of nutrients like nitrogen and phosphorus. When sewage enters water bodies, it can lead to eutrophication.
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