Ключевые слова: alternative, background, bright, bulb, bulbs, concept, creative, earth, eco, ecology, electric, electricity, energy, engineering, environment, flower, friendly, future, global, green, hand, holding, idea, innovation, invention, lamp, light, lightbulb, natural, nature, planet, plant, power, protect, recycle, renewable, resource, sky, solar, solution, solutions, sun, sunlight, sunset, sunshine, symbol, technology, tree, urban, warming, white,