Ключевые слова: air, atmosphere, billowing, bleak, blue, building, chemical, chimney, dirty, ecology, energy, environment, environmental, exhaust, factory, fuel, gas, global, gray, industrial, manufacturing, obscuring, ominous, pipe, plant, pollution, power, production, sky, smog, smoke, smokestack, spewing, stack, steam, technology, thick, tower, toxic, warming,