Ключевые слова: air, billow, carbon, chemical, co, co2, contaminate, damage, danger, dioxide, dirty, energy, environment, fog, fume, gas, generation, geo, global, grunge, harmful, industrial, manufacturing, nature, ozone, poison, pollute, pollution, power, problem, risk, safety, saturated, saving, silhouette, sky, smog, smoke, smokestack, steam, sulfur, sun, sunbeam, sunny, tower, toxic, warming, waste, yellow,