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… per cent a year. Surface waters are polluted by untreated waste water, and irrigation and hydro- electric projects are …

… built into practical work on many different areas such as waste management, economic use of nature resources, new bio- … consumption of resources (land, water, energy), and waste and sewage products also have a negative impact (Engels … to Environmental Protection which primarily includes waste treatment, energy and infrastructure and 1% (€5.5 …

… and phosphorus, from fertilizers and human or animal waste causes artificial enrichment (eutrophication) of water …