Ключевые слова: background, brown, canal, chemical, clean, contamination, damage, danger, dirt, dirty, disaster, drain, drainage, dump, ecological, ecology, environment, environmental, factory, flow, flowing, fluid, garbage, global, green, industrial, industry, liquid, natural, nature, pipe, plant, plastic, pollute, pollution, recycling, river, rusty, sand, sewage, sewer, stream, summer, technology, toxic, trash, tube, unhygienic, waste, water,