Ключевые слова: air, atmosphere, breathe, carbon, chemical, chimney, chimneys, climate, cloud, coal, contamination, danger, dioxide, dirty, ecology, emission, energy, environment, environmental, exhaust, factory, fume, gas, global, harmful, ice, industrial, industry, landscape, ozone, pipe, plant, pollute, pollution, power, production, refinery, river, silhouette, sky, smog, smoke, stack, steam, technology, tower, toxic, vapor, warming, white,