Ключевые слова: air, atmosphere, blue, building, chemical, chimney, co2, coal, danger, dioxide, dirty, ecology, electricity, emission, energy, environment, environmental, exhaust, factory, fuel, fumes, gas, global, industrial, industry, manufacturing, nature, pipe, plant, pollute, pollution, power, production, red, refinery, sky, smog, smoke, station, steam, steel, technology, tower, toxic, vapor, warming,