Ключевые слова: alternative, blue, bright, building, chimney, clean, cloud, ecology, energy, environment, europe, exhaust, exterior, fuel, fumes, gas, generation, geothermal, green, heat, iceland, industrial, industry, lake, landscape, metal, mountain, nature, nobody, outdoors, pipe, pipeline, plant, pond, power, sky, smoke, spring, station, steam, sulfuric, sunlight, sunny, travel, tube, turquoise, volcanic, water, white,