Ключевые слова: air, atmosphere, blue, carbon, chemical, chimney, city, climate, cloud, dioxide, dirty, earth, ecology, energy, environment, environmental, evening, factory, fuel, gas, global, industrial, industry, landscape, manufacturing, metal, night, oil, pipe, pipes, plant, pollution, power, power plant, production, refinery, silhouette, sky, smog, smoke, stack, station, steam, sunset, technology, tower, toxic, urban, warming, winter,