Which eight problems have been identified by the United Nations which cause damage to natural environment?

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Following eight problems have been identified by the United Nations which cause damage to natural environment: 

1. Ozone depletion 

2. Global warming 

3. Fresh water quality and quantity 

4. Deforestation 

5. Land degradation 

6. Solid and hazardous waste 

7. Water pollution 

8. Danger to biological diversity.

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