Name two discoverles of chemistry which have helped mankind and the same discoveries have harmed the mankind and how?

Explanation

### Step-by-Step Solution:

1. **Identify Two Discoveries in Chemistry**:
- The first discovery is **chemical fertilizers**.
- The second discovery is **nuclear energy**.

2. **Discuss the Positive Impact of Chemical Fertilizers**:
- Chemical fertilizers have significantly increased agricultural productivity. They provide essential nutrients to crops, leading to higher yields and helping to feed a growing population.
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