Ключевые слова: air, blue, building, business, chemical, chimney, climate, cloud, coal, dirty, dusk, ecology, electricity, emission, energy, environment, environmental, factory, fuel, fume, gas, generation, generator, global, heat, industrial, industry, manufacturing, nuclear, oil, pipe, plant, pollution, power, production, refinery, sky, smog, smoke, smokestack, station, steam, technology, tower, toxic, warming,