Effect of human beings on Nature 426 Human ecology 189 History 146 Climatic changes 94 Environmental conditions 89 Ecology 74 rhagor ... Social aspects 73 Environmental aspects 66 Environmental degradation 42 Environmental policy 36 Global environmental change 36 Human beings 31 Effect of environment on 29 Environmental protection 28 Environmentalism 28 Human-animal relationships 28 human ecology 26 Philosophy 25 Landscape changes 23 Political aspects 20 Natural history 19 Social conditions 17 Environmental ethics 16 Global warming 15 Sustainable development 15 Human geography 14 Moral and ethical aspects 14 Nature conservation 14 Economic aspects 13 llai ...