Ключевые слова: air, atmosphere, background, blue, building, carbon, chemical, chimney, climate, cloud, coal, contamination, damage, dioxide, dirty, ecology, emission, energy, environment, environmental, exhaust, factory, fuel, fume, gas, global, industrial, industry, manufacturing, nature, pipe, plant, poison, pollution, power, production, refinery, sky, smog, smoke, stack, station, steam, steel, technology, tower, toxic, vapor, warming, white,