Ключевые слова: alternative, background, bulb, business, concept, creative, earth, eco, ecology, electricity, energy, environment, equipment, future, glass, global, grass, green, growth, idea, industry, innovation, invention, knowledge, lamp, leaf, light, lightbulb, natural, nature, planet, plant, power, protect, recycle, renewable, research, resource, resources, saving, sunlight, sustainability, sustainable, technology, tree, water,