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fotochemie --- zure regen --- smog --- luchtverontreiniging --- ozon --- Environmental protection. Environmental technology --- 632.15 --- 502.5 --- The nature complex as a whole. Balance. Danger. Damage. Threat of destruction --- 502.5 The nature complex as a whole. Balance. Danger. Damage. Threat of destruction

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Water --- Eau --- Pollution --- 502.5 --- 504.4.064 --- The nature complex as a whole. Balance. Danger. Damage. Threat of destruction --- 502.5 The nature complex as a whole. Balance. Danger. Damage. Threat of destruction

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Hygiene. Public health. Protection --- General ecology and biosociology --- Environmental protection. Environmental technology --- 502.5 --- 502.5 The nature complex as a whole. Balance. Danger. Damage. Threat of destruction --- The nature complex as a whole. Balance. Danger. Damage. Threat of destruction

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CON Bioconservation --- bioconservation --- 502.5 --- -Conservation of resources --- Resources conservation, Natural --- Natural resources conservation areas --- Conservation of natural resources. --- -The nature complex as a whole. Balance. Danger. Damage. Threat of destruction --- Conservation of natural resources --- Conservation of resources --- Natural resources --- Natural resources conservation --- Environmental protection --- 502.5 The nature complex as a whole. Balance. Danger. Damage. Threat of destruction --- The nature complex as a whole. Balance. Danger. Damage. Threat of destruction --- Conservation --- Water supply. Water treatment. Water pollution

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milieuverontreiniging --- ecologie --- Environmental protection. Environmental technology --- milieuproblematiek --- Sociology of environment --- 614.7 --- 502.5 --- leefmilieu --- milieubeleid --- vervuiling --- 504.75 --- asbest --- bodemverontreiniging --- luchtverontreiniging --- pesticiden --- Pollutie van lucht, water, grond--(openbare gezondheidszorg) --- The nature complex as a whole. Balance. Danger. Damage. Threat of destruction --- environnement --- politique de l'environnement --- pollution --- 502.5 The nature complex as a whole. Balance. Danger. Damage. Threat of destruction