Ключевые слова: aerial view, air pollution, architecture, backgrounds, building exterior, built structure, business, business finance and industry, chimney, city, color image, concepts, day, digitally generated image, dirty, environment, environmental conservation, environmental issues, equipment, exploration, factory, fantasy, fuel and power generation, futuristic, global, horizontal, illustration, imagination, industrial building, industry, landscape scenery, manufacturing, nature, no people, one person, outdoors, outer space, people, pipe tube, plant, pollution, protection, refinery, science, sky, smoke physical structure, social issues, technology, water,