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Ключевые слова:
air, atmosphere, backgrounds, blue, building, chemical, chemistry, chimney, climate, cloud, contamination, damage, dioxide, dirty, ecology, emissions, energy, environment, environmental, exhaust, factory, fuel, fumes, gas, global, greenhouse, high, industrial, industry, manufacturing, nature, pipe, plant, pollution, power, refinery, sky, smog, smoke, smokestack, stack, steam, technology, tower, toxic, vapor, warming, waste, white,