Ключевые слова: air, atmosphere, building, chemical, chimney, climate, cloud, coal, danger, dioxide, dirty, ecology, emission, energy, environment, environmental, exhaust, factory, fog, fuel, fume, gas, global, global warming, industrial, industry, manufacturing, nature, oil, pipe, plant, pollution, power, production, refinery, sky, smog, smoke, stack, station, steam, sunset, technology, tower, toxic, warming,