Dégradation Environmental degradation 104 Environnement Human ecology 37 SOCIAL SCIENCE 32 Ecology 31 Écologie humaine 30 General 30 Environmental policy 29 Nature 29 Politique gouvernementale 29 SCIENCE 29 Environmental conditions 28 Effect of human beings on 26 Influence sur la nature 26 Êtres humains 23 POLITICAL SCIENCE 21 BUSINESS & ECONOMICS 20 Human Geography 20 Public Policy 20 Environmental Policy 19 Pollution 19 human ecology 18 Conditions environnementales 17 Environmental protection 17 Histoire 17 History 17 Protection 17 Environmental Science (see also Chemistry 14 Environmental) 14