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43.00 environmental science: general Environnement 5 Protection 5 Environmental protection 4 environmental protection 4 Écologie humaine 3 Human ecology 3 more ... Effect of human beings on 2 Environmental policy 2 Environmental sciences 2 Homme 2 Influence sur la nature 2 Milieubeleid 2 Milieukunde 2 Natural resources 2 Nature 2 Politique gouvernementale 2 Sciences de l'environnement 2 Umweltschutz 2 43.40 environmental problems: general 1 86.80 international law: general 1 89.90 foreign policy 1 Abbaureaktion 1 Acid Rain 1 Acid rain 1 Air 1 Air quality management 1 Aspect de l'environnement 1 Atmospheric ozone 1 Bibliografie 1 less ...

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