SUBJECT
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Energy development
44
Conservation of natural resources
43
Law and legislation
43
Economic conditions
42
Urbanization
42
Water resources development
41
Factory and trade waste
40
Globalization
40
Energy conservation
39
Environmental law
39
Greenhouse gases
35
History
35
Urban transportation
35
Automobiles
34
Effect of human beings on
34
Purification
34
Economic development projects
33
Exhaust gas
33
Mathematical models
33
Political aspects
33
Ecotourism
32
Regional planning
32
Free trade
31
Motors
31
Sustainable engineering
31
Tourist trade
31
Global environmental change
30
Mines and mineral resources
30
Mining industry
30
Nature
30
Urban ecology
29
Air quality management
28
Business enterprises
28
Dams
28
Mines and mining
28
Waste disposal
28
Energy industries
27
Environmental engineering
27
Hazardous wastes
27
Citizen participation
26
Climate change mitigation
26
Energy consumption
26
Environmental degradation
26
Evaluation
26
Risk assessment
26
Sewage
26
Transportation and state
26
Agriculture and state
25
Econometric models
25
Sustainable buildings
25
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