Subject
Environmental protection
Social ecology
Conservation of natural resources Economic aspects
19
Human ecology
16
Nature Effect of human beings on
15
Population policy
14
Rural-urban migration
14
Social change
14
Urbanization
14
Environmental geography
12
Human geography Environmental aspects
12
Human geography
11
Cultural geography
8
Economic geography
7
Human geography Economic aspects
7
Conservation of natural resources Waste disposal
6
Natural resources
6
Refuse and refuse disposal
6
Toxicology
6
Water Pollution
6
Africa South of the Sahara Social conditions
4
Hydrology
4
Land use Environmental aspects
4
Landforms
4
Water Environmental aspects
4
Business ethics
3
International economic relations
3
Management Moral and ethical aspects
3
Political planning
3
Power (Social sciences)
3
Public policy (Law)
3
Social classes
3
Social policy
3
Urban geography
3
Wealth
3
Architecture, Modern
2
China
2
Climatology
2
Conservation of natural resources Government policy
2
Ecosystem management
2
Philosophy Study and teaching
2
Africa History
1
Africa, North Social conditions
1
Air pollution
1
Architecture Study and teaching
1
Asia, Southeastern
1
Australia
1
Biodiversity Conservation
1
Biology Study and teaching
1
Climatic changes
1
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