SUBJECT
Effect of human beings on
History
Nature
15
Human ecology
9
Environmental conditions
4
Environmental degradation
4
Biotic communities
3
Ecology
3
Environmental management
2
Environmentalism
2
Global environmental change
2
Life zones
2
Natural resources
2
Natural resources conservation areas
2
Paleoecology
2
Agricultural ecology
1
Citizen participation
1
Civilization, Medieval
1
Environmental policy
1
Fishes
1
Green movement
1
Human geography
1
Lake ecology
1
Landscape changes
1
Sex role
1
Social conditions
1
Women and the environment
1
World history
1
Zoology
1