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...Department of environmental studies university delhi six month module for undergraduate courses unit introduction to multidisciplinary nature scope and importance need public awareness lectures ecosystems concept an ecosystem structure function energy flow in food chains webs ecological pyramids succession case the following a forest b grassland c desert d aquatic ponds streams lakes rivers oceans estuaries natural resources renewable non land landuse change as resource degradation landslides man induced soil erosion desertification forests use over exploitation deforestation impacts mining dam building on environment biodiversity tribal populations resettlement rehabilitation project affected persons problems concerns water surface ground floods drought conflicts international inter state world changes caused by agriculture overgrazing effects modern fertilizer pesticide logging salinity sources alternate growing needs conservation levels biological diversity genetic species biogeogra...