Ключевые слова: background, bright, bulb, concept, conceptual, costs, creative, earth, eco, ecology, electric, electricity, energy, environment, environmental, european, finger, future, glass, global, good, growth, hand, heat, human, idea, ideas, invention, isolated, lamp, light, lightbulb, money, natural, nature, one, palm, person, planet, plant, power, smart, solar, solution, symbol, technology, tree, warming, white,