Effect of human beings on Nature 618 Human ecology 247 History 190 Climatic changes 114 Environmental conditions 102 Environmental aspects 90 more ... Ecology 88 Social aspects 86 Environmental policy 59 Environmental degradation 55 Global environmental change 48 Human beings 47 Effect of environment on 44 Environmentalism 38 Philosophy 38 Environmental protection 37 Human-animal relationships 32 Pollution 30 Landscape changes 29 human ecology 26 Social conditions 23 Political aspects 22 Environmental sciences 21 Nature conservation 21 Global warming 20 Human geography 20 Natural history 20 Environmental ethics 19 Extinction (Biology) 19 less ...