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Environmental protection
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9
Environmental policy
4
Human ecology
2
Technological innovations
2
Airplane
1
Bird disease
1
Conservation of natural resources
1
Ecology
1
Environment
1
Environmental engineering
1
Fish farm
1
Fishing
1
Human beings
1
Industrial productivity
1
Industrialization
1
Media junk
1
Natural resources
1
Peace movements
1
Pollution
1
Sustainable development
1