Subject
Environmental conditions
Environmental policy
History
Human ecology
6
Environmental degradation
4
Effect of human beings on
3
Nature
3
Climatic changes
2
Environmental aspects
2
Ethnoecology
2
Government policy
2
Political aspects
2
Rivers
2
Social conditions
2
Stream ecology
2
Water-supply
2
Ecology
1
Indigenous peoples
1
Landscape changes
1
Natural resources
1
Political ecology
1
Politics and government
1