Conservation of natural resources Environmental policy 200 Natural resources 117 Environmental protection 112 Environmental management 93 Ecology 88 Management 88 mer ... Medio ambiente 85 Administracion 83 Sustainable development 83 Environmental aspects 80 History 73 Human ecology 73 Recursos naturales 67 Nature conservation 56 Government policy 55 Effect of human beings on 54 Nature 54 Conservacion 48 Politica medioambiental 46 Wildlife conservation 46 Biodiversity conservation 39 Climatic changes 37 Politica ambiental 37 Citizen participation 36 Law and legislation 36 Economic aspects 34 Environmental conditions 30 Renewable energy sources 28 Sustainable agriculture 27 mindre ...