Ключевые слова: alternative, background, bio, cable, clean, concept, conservation, copy, creative, day, earth, eco, ecological, ecology, electric, electrical, electricity, element, energy, environment, environmental, flat, global, green, hour, idea, innovation, international, leaf, modern, natural, nature, organic, planet, plant, plug, power, recycle, recycling, renewable, resource, save, saving, sign, socket, space, sustainable, symbol, technology, vertical,