pollution Ecology 3 Biochemical process 1 Ecosystems 1 Environment 1 Environment protection 1 Human pathology 1 Public sector 1 Social problems 1 Soil 1 act 1 aggregate demand 1 atmosphere 1 biosphere 1 climatology 1 energetics 1 enviornmental problems 1 health hazzards 1 management 1 monetary damage functions 1 population 1 pyto-engineering 1 species interaction 1 succession 1 world biota 1