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Nature conservation Environmental protection 13 Human ecology 5 Environmental sciences 4 Agriculture 3 Biotic communities 3 Coastal waters 3 περισσότερα ... EC 3 Energy 3 Environment 3 Environmental management 3 Environmental policy 3 Forestry 3 History 3 Industry 3 Land use 3 Nature 3 Ozone 3 Tourism 3 Transport 3 Περιβαλλοντική προστασία 3 Acid rain 2 Air quality 2 Aquaculture 2 Architecture 2 Chemicals 2 City planning 2 Climate 2 Consumers 2 Effect of human beings on 2 λιγότερα ...