Ключевые слова: background, chemical, contamination, damage, danger, dirt, dirty, disaster, drain, dump, ecology, environment, environmental, factory, flowing, garbage, global, industrial, industry, lake, metal, natural, nature, oil, old, pipe, plant, plastic, pollute, pollution, pond, problem, problems, recycling, river, sanitary, sewage, sewer, smell, stream, surface, technology, toxic, trash, tube, unhygienic, warming, waste, water, water pollution,