Ключевые слова: alternative energy, blue, blue sky, building, clear sky, concrete, container, copy space, day, energy, factory, fossil fuel, front view, fuel, gas pipeline, gray, green, industrial, industry, large, metal, nobody, outdoors, pipe, pipe connector, pipeline, power plant, power station, red, selective focus, side view, silver, sky, steel, storage tank, tree, tube, water pipe,