What is optimum percentage of forest area recommended by the National Forest policy (1988) for the plains and the hills respectively? List any four problems caused due to deforestation.

Explanation

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

1. **Understanding the National Forest Policy (1988):**
- The National Forest Policy was established in 1988 to address the management and conservation of forest resources in India.

2. **Optimum Percentage of Forest Area:**
- According to the National Forest Policy (1988):
- For plains, the optimum percentage of forest area recommended is **33%**.
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