Ключевые слова: air, blue, brown, building, carbon, chemical, chimney, color, construction, danger, dioxide, dirty, electricity, energy, environment, environmental, factory, fog, fuel, fumes, gas, generation, global, grunge, industrial, industry, large, light, manufacturing, nature, outdoors, pipe, plant, pollution, power, safety, silhouette, sky, smog, smoke, station, steam, sun, sunrise, sunset, technology, tower, warming, winter, yellow,