Ключевые слова: air, atmosphere, background, blue, building, chemical, chemistry, chimney, city, climate, coal, construction, ecology, electric, electricity, energy, environment, environmental, factory, fuel, furnace, gas, generation, heat, heater, industrial, industry, manufacturing, metal, pipe, plant, pollution, power, production, silhouette, sky, smog, smoke, station, steam, steel, sun, sunrise, sunset, technology, tower, transmission, tube, urban, warming,