Ключевые слова: air, atmosphere, background, banner, business, carbon, chemical, chimney, clean, climate, coal, contamination, dirty, eco, ecology, emission, emissions, energy, environment, environmental, europe, factory, fume, gas, global, globe, green, heavy, house, icon, industrial, industry, manufacturing, nature, pipe, pipes, plant, pollution, power, production, smog, smoke, steam, steel, sun, sustainable, technology, tower, toxic, warming,