Ключевые слова: air, building, carbon, chemical, chimney, climate, cloud, coal, condensation, construction, danger, day, dioxide, dirty, emission, energy, environment, environmental, factory, fossil, fumes, gas, global, heat, industrial, industry, oil, outdoors, ozone, pipe, plant, pollution, polution, power, refinery, sky, smog, smoke, station, steam, substance, sunrise, sunset, technology, tower, toxic, warming, white, wind,