Ключевые слова: air, atmosphere, backgrounds, blue, carbon dioxide, chimney, clear, cloud, copy space, day, dirty, energy, environment, environmental damage, exhaust, factory, fuel and power generation, fumes, global warming, industry, manufacturing, nature, no people, outdoors, pipe, plant, pollution, power station, sky, smog, smoke, smoke stack, smokestack, square, sunlight, toxic, white,