Ключевые слова: air, atmosphere, background, blue, burning, carbon, chemical, chimney, climate, cloud, co2, coal, contamination, dioxide, ecology, effect, emission, energy, environment, environmental, exhaust, factory, fossil, fuel, fumes, gas, generator, global, greenhouse, heating, industrial, industry, nature, oil, pipe, plant, pollution, power, refinery, sky, smog, smoke, smoke stack, smokestack, steam, tall, tower, toxic, warming, white,