Ключевые слова: air, atmosphere, background, building, carbon, cartoon, chemical, chimney, cloud, concept, danger, dioxide, dirty, ecology, electricity, emission, energy, environment, environmental, factory, fuel, gas, global, industrial, industry, metal, modern, petrochemical, petroleum, pipe, plant, poison, pollution, power, problem, refinery, sky, smog, smoke, stack, steam, structure, technology, tower, toxic, vapor, warming, white,