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Nature protection --- natuurbescherming --- Pedology --- Forestry --- 634 --- 338.43 --- 502.5 --- 504.05 --- 504.53 --- 630*914 --- Landbouweconomie --- The nature complex as a whole. Balance. Danger. Damage. Threat of destruction --- Unfavourable influences of human activities on the environment. Ecotoxicology --- Earth surface. Soil environment --- Relations between forest and waste land. Utilization and afforestation of waste land. Deforestation --- Agriculture --- Nature --- Food supply. --- Soil erosion. --- Environmental aspects. --- Effect of human beings on. --- 630*914 Relations between forest and waste land. Utilization and afforestation of waste land. Deforestation --- 504.53 Earth surface. Soil environment --- 504.05 Unfavourable influences of human activities on the environment. Ecotoxicology --- 502.5 The nature complex as a whole. Balance. Danger. Damage. Threat of destruction --- 338.43 Landbouweconomie --- silviculture --- Environmental planning --- deforestation