Ключевые слова: above, aerial, background, biology, circle, city, cityscape, clean, construction, dirty, ecology, environment, environmental, facility, factory, green, h2o, health, healthy, iceland, industrial, industry, life, night, plant, pollution, public, purification, purified, purity, recycle, recycling, removal, round, sewage, sludge, storage, supply, tank, technology, top, treatment, urban, utility, view, waste, wastewater, water,