Ключевые слова: alternative energy, background, chimney, city, climate, cloud, cold, dusk, eco, ecological, ecology, energy, environment, environmental, factory, frozen, generation, geothermal, global, heating, industry, innovation, lake, landscape, nature, outdoor, plant, pollution, power, power plant, region, river, sky, smoke, snow, social issues, station, steam, surface, system, technology, temperature, thermal, thermal power station, twilight, urban, warmth, water, winter,