Ключевые слова: alternative, architecture, branch, chemical, chimney, chimneystalks, clean, concept, concern, earth, eco, ecology, electricity, emission, energy, environment, environmental, exhalation, factory, funnel, global, green, grow, growth, industrial, industry, innovation, manufacturing, outdoors, pipe, plant, pollution, power, problem, production, protection, resource, shape, sky, smog, smoke, solution, stack, stackfurnace, steel, technology, tower, toxic, tree,