Ключевые слова: alternative, background, bulb, business, clean, concept, conservation, creative, earth, eco, ecological, ecology, economy, electric, electricity, energy, environment, environmental, friendly, future, global, green, growth, idea, innovation, invention, leaf, life, light, light bulb, lightbulb, money, natural, nature, planet, plant, power, protection, renewable, resource, save, soil, solar, solution, sustainability, sustainable, symbol, technology, tree,