SUBJECT
Nature
Effect of human beings on
183
Human ecology
77
Environmental aspects
29
Ecology
27
History
21
Environmental protection
20
Environmental sciences
20
Environmental degradation
19
Environmental policy
19
Human beings
17
Pollution
17
Effect of environment on
16
Global environmental change
13
Sustainable development
13
Climatic changes
12
Religious aspects
11
Biotic communities
10
Conservation of natural resources
10
Effects of human beings on
10
Social aspects
10
Christianity
9
Environmentalism
9
Economic development
8
Natural resources
8
Philosophy
8
Electronic books
7
Ecosystem management
6
Environmental conditions
6
Nature conservation
6
Research
6
Citizen participation
5
Environmental ethics
5
Global warming
5
Greenhouse effect, Atmospheric
5
Juvenile literature
5
Climatology
4
Environmental psychology
4
Environmental responsibility
4
Indigenous peoples
4
Psychological aspects
4
Rain forest ecology
4
Weather
4
Congresses
3
Deforestation
3
Description and travel
3
Effect of human being on
3
Environmental management
3
Forecasting
3
Human geography
3
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