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Ключевые слова:
air, atmosphere, blue, burn, carbon, chemical, chimney, clear, climate, cloud, clouds, coal, dioxide, dirty, dump, ecology, electricity, emission, energy, exhaust, factory, gas, global, heat, heating, industrial, industry, ozone, pipe, pipes, planet, plant, pollution, power, refinery, sky, smog, smoke, stack, steam, technology, tower, vapor, warm, warming, white, winter,