What are the by-products of fertiliser industries ? How do they affect the environment ?

Explanation

### Step-by-Step Solution:

1. **Identify By-products of Fertilizer Industries:**
- The by-products of fertilizer industries primarily include harmful chemicals and pesticides. These substances are released into the environment through gas exhaust and effluent (wastewater) from the manufacturing processes.

2. **Understand the Nature of These By-products:**
- Many of these by-products are non-biodegradable, meaning they cannot be broken down or digested by biological agents in the ecosystem. This characteristic makes them particularly hazardous to the environment.

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