Ключевые слова: algae, background, chemical, contaminated, contamination, danger, dirty, drain, drainage, dump, ecology, environment, environmental, eutrophication, flow, flowing, garbage, grass, green, industrial, industry, lake, landscape, liquid, natural, nature, nobody, oil, old, outdoors, pipe, pipeline, plant, polluted, polluting, pollution, pond, remediation, river, sewage, sewer, stagnant, stream, substance, surface, toxic, waste, water,