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Ecology --- Environmental protection --- Nature --- -Environmental quality management --- Protection of environment --- Environmental sciences --- Applied ecology --- Environmental engineering --- Environmental policy --- Environmental quality --- Balance of nature --- Biology --- Bionomics --- Ecological processes --- Ecological science --- Ecological sciences --- Environment --- Environmental biology --- Oecology --- Population biology --- Effect of human beings on --- Human ecology. Social biology --- Nature protection --- Environmental protection. Environmental technology --- Third World: economic development problems --- Ecologie --- Environnement --- Homme --- Protection --- Influence sur la nature --- Ecology. --- Environmental protection. --- Milieu --- Effect of human beings on. --- Algemeen. --- Environmental quality management --- Anthropogenic effects on nature --- Ecological footprint --- Human beings --- Anthropogenic soils --- Human ecology --- 33 --- 330.111.4 --- 330.341 --- 338.26 --- 339.5 --- --- 574 --- 631.6 --- 631.95 --- Conservation of natural resources. --- Developing countries: economic development problems --- Nature - Effect of human beings on