Ключевые слова: alternative, arrow, cartoon, chimney, choose, city, clean, coal, direction, directional, dirty, ecology, electric, energy, environment, factory, finite, flat, fossil, fuel, gas, generation, generator, industrial, isolated, landscape, nuclear, panel, plant, polluting, pollution, power, powerhouse, radioactivity, reactor, renewable, resources, sign, signage, skyline, smog, solar, source, station, sun, sustainable, turbine, turbines, wind, windmill,