Ключевые слова: air, atmosphere, background, blue, building, business, carbon, chemical, chimney, city, climate, cloud, coal, damage, danger, dioxide, dirty, ecology, electricity, emission, energy, environment, environmental, factory, fog, forest, fuel, gas, global, heavy, industrial, manufacturing, nature, pipe, plant, pollution, power, production, sky, smog, smoke, smokestack, stack, station, steam, technology, tower, toxic, warming, white,