Nature Human ecology 41 Effect of human beings on 16 Human beings 11 Ecology 9 Culture 8 Environmental policy 7 Environmental sciences 7 Global environmental change 7 Science 7 Cosmology 6 Environment 6 Philosophy 6 Biotic communities 5 Climatic changes 5 Environmental degradation 5 Religious aspects 5 Effect of environment on 4 Environmental ethics 4 History 4 Human geography 4 Philosophy of nature 4 Pollution 4 Tourism 4 Agricultural ecology 3 Civilization 3 Environmental protection 3 Natural resources 3 Organic farming 3 Postmodernism 3