Ключевые слова: air, atmosphere, breath, business, carbon, chemical, chimney, city, cityscape, civilization, climate, climatic, clouds, co2, coal, cooling, danger, dioxide, disaster, ecology, electricity, emission, energy, environment, environmental, exhaust, factory, fog, fuel, future, gas, global, greenhouse, health, industrial, industry, kyoto, nuclear, oil, oxygen, pipes, planet, pollution, power, sky, smog, smoke, steam, toxic, warming,