Human ecology History 397 Nature 302 Effect of human beings on 267 Environmental conditions 198 Religious aspects 165 Social aspects 159 more ... Philosophy 151 Environmental aspects 125 Ecology 106 Environmental protection 105 Environmental policy 91 Sustainable development 81 Christianity 80 Climatic changes 77 Human beings 76 Environmental ethics 73 Environmentalism 72 Philosophy of nature 71 Social conditions 69 Environmental degradation 67 Effect of environment on 63 Antiquities 59 Social ecology 53 Environmental sciences 51 Natural history 50 Ecologia humana 46 Economic aspects 46 Human geography 46 Social life and customs 45 less ...