Ключевые слова: air, atmosphere, background, building, business, carbon, chemical, chimney, city, climate, cloud, coal, construction, dioxide, dirty, ecology, emission, energy, environment, environmental, exhaust, factory, fuel, fume, gas, global, industrial, landscape, manufacturing, nature, oil, orange, pipes, plant, pollution, power, production, refinery, silhouette, sky, smog, smoke, smokestack, stack, steam, sunset, technology, tower, toxic, warming,