Ключевые слова: air, atmosphere, background, blue, brick, carbon, chemicals, chemistry, chimney, climate, dangerous, dioxide, dirty, ecology, emission, emissions, energy, environment, exhaust, factory, fuel, fumes, gas, global, heat station, hydroelectric, industrial, industry, manufacturing, morning, pipe, plant, pollution, power, processing, red, sky, smog, smoke, station, steam, sublime, technology, toxic, trumpet, urban, warm, warming, white, wind,