SUBJECT
Human ecology
Environmental sciences
87
Environmental policy
83
Environmental protection
81
Nature
43
Effect of human beings on
38
Philosophy
37
Pollution
33
Sustainable development
31
History
28
Conservation of natural resources
24
Human geography
24
Man
23
Ecology
21
Environmental degradation
21
Study and teaching
20
Environmental aspects
19
Environmentalism
18
Natural resources
17
Social aspects
17
Ethnology
16
Human beings
16
Influence on nature
16
Economic conditions
15
Environmental conditions
15
Social ecology
15
Social conditions
13
Indigenous peoples
12
Social life and customs
12
Congresses
11
Religious aspects
11
Biological diversity
10
Biotic communities
10
Economic development
10
Effect of environment on
10
Environmental education
10
Human evolution
10
Moral and ethical aspects
10
Global environmental change
9
Environmental ethics
8
Influence of environment
8
Population
8
Cities and towns
7
Addresses, essays, lectures
6
Anthropology
6
Geography
6
Landscape assessment
6
Nature conservation
6
Philosophy of nature
6
Research
6
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