Environmentalism History 253 Environmental policy 209 Environmental aspects 130 Environmental protection 116 Political aspects 100 Human ecology 96 more ... Green movement 91 Social aspects 91 Nature 83 Philosophy 69 Environmental conditions 68 Sustainable development 67 Effect of human beings on 64 Religious aspects 54 Citizen participation 53 Sustainable living 45 Environmentalists 43 Environmental sciences 42 Sustainability 42 Climatic changes 38 Environmental ethics 38 Economic aspects 37 Environmental justice 34 Environmental responsibility 31 Social conditions 27 Conservation of natural resources 26 Government policy 25 Pollution 25 Ecology 24 less ...