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