Ключевые слова: air, atmosphere, carbon, chemical, chimney, city, climate, cloud, contamination, dark, dirty, ecology, emission, energy, environment, environmental, factory, fog, fuel, fume, gas, global, industrial, landscape, manufacturing, orange, pipe, plant, pollution, power, production, refinery, silhouette, sky, smog, smoke, smokestack, stack, station, steam, sun, sunrise, sunset, technology, tower, toxic, urban, view, warming, yellow,