Ключевые слова: agriculture, air, atmosphere, black, blue, cane, change, chimney, climate, cloud, conservation, contamination, crushed, crushing, ecological, ecology, electricity, emission, energy, environment, factory, fiber, generation, generator, global, growers, industrial, industry, light, manufacturing, mill, particulates, plant, polluting, pollution, power, primary, producer, production, puffs, refinery, season, sky, smoke, stack, steam, sugar, technology, tower, warming,