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Ключевые слова:
air, chemical, chimney, climate, cloud, coal, current, dawn, dioxide, ecology, electric, electricity, emission, energy, enterprise, environmental, factory, fog, frozen, gas, global, heaven, hydro, industrial, industry, light, manufacturing, nature, pipe, pollution, pond, power, production, sky, smog, smoke, snow, station, steam, sunset, support, technology, thermal, tower, toxic, water, watt, winter, wire,