Ключевые слова: against, air, atmosphere, background, blue, chemical, chimney, clear, climate, cloud, coal, construction, contamination, day, dioxide, dirty, ecology, electricity, emissions, energy, environment, environmental, exhaust, factory, fuel, gas, global, high, industrial, industry, manufacturing, nature, pipe, plant, pollution, power, red, sky, smog, smoke, stack, station, steam, technology, thermal, tower, toxic, vapor, warming, white,