Subject
Water Environmental aspects
71
Land use Environmental aspects
59
Environmental protection
26
Conservation of natural resources Economic aspects
25
Water Environmental aspects Measurement
25
Human ecology
18
Water Pollution
18
Water quality
18
Nature Effect of human beings on
17
Trace elements in water Environmental aspects
15
Environmental geography
11
Human geography
11
Human geography Environmental aspects
11
Irrigation water Environmental aspects
11
Food Safety measures
10
Food handling
10
Food security
10
Food supply
10
Human geography Economic aspects
10
Mine water Environmental aspects
10
Conservation of natural resources Waste disposal
9
Economic geography
9
Refuse and refuse disposal
9
Toxicology
9
Ballast water Environmental aspects
8
Geomorphology
8
Physical geography
8
Social ecology
8
Discharge of ballast water Environmental aspects
7
International economic relations
7
Marine ecology
7
Marine resources
7
Oceanography
7
Population policy
7
Rural-urban migration
7
Social change
7
Submarine geology
7
Urbanization
7
Biodiversity Conservation
6
Biotic communities
6
Energy consumption
6
Energy development
6
Hydrology
6
International business enterprises Management
6
Landforms
6
Natural resources
6
Natural resources Management
6
Power resources Environmental aspects
6
Water quality management
6
Biosphere
5
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