Ключевые слова: air, atmosphere, building, chimney, danger, dioxide, dirty, electricity, energy, environment, environmental, factory, fog, fuel, fumes, gas, generation, global, gray, hot, industrial, industry, large, manufacturing, nature, pipe, plant, pollution, power, problem, risk, safety, saving, sky, smog, smoke, smokestack, stack, station, steam, technology, tower, trees, urban, warming,