Ключевые слова: air, atmosphere, background, building, chemical, child, children, children education, chimney, climate, co2, coal, danger, ecology, emission, energy, environment, environmental, exhaust, factory, fog, fossil, fuel, gas, global, greenhouse, health, industrial, industry, kid, mister leader, mouth, pipe, plant, poison, pollute, pollution, power, problem, protection, sky, smog, smoke, smoking, steam, technology, toxic, urban, warming,