Ключевые слова: air, brown, building, chimney, co2, color, danger, dioxide, dirty, electricity, energy, environment, environmental, factory, fog, fumes, gas, generation, geo, global, grunge, hot, industrial, industry, large, manufacturing, nature, pipe, plant, pollution, power, problem, risk, safety, saturated, saving, sky, smog, smoke, station, steam, steel, sun, sunbeam, technology, tecnology, tower, warming, yellow,