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… employment, safety, health, quality of life, social security, appreciation of the presence of animal and plant … by noise or lights, pollution through air, etc. Food web structure and interactions: Species or groups of species perform certain roles in the food web (functional groups); changes in species composition …

… as a ‘fugitive’ resource: that means that – unlike land, food, trees, minerals or even people – when left alone water … on grounds of: flood control, more irrigation for food or fibre production, urban or industrial supply, … or quantity of water or ecosystems; threatened livelihood security etc. • Construction cost over- runs, or unprofitable …