Ключевые слова: aerial, air, atmosphere, background, building, business, chemical, chimney, city, climate, cloud, coal, contamination, damage, dirty, ecology, electricity, emission, energy, environment, environmental, factory, gas, global, global warming, industrial, landscape, manufacturing, nature, pipe, plant, pollution, power, production, refinery, sky, smog, smoke, smokestack, station, steam, sunset, technology, tower, toxic, urban, warming,