Ключевые слова: alternate, bulb, clean, concept, conservation, consumption, creative, development, earth, earth day, eco, ecological, ecology, economy, electric, electricity, energy, environmental, friendly, future, generate, globe, grass, green, grow, growth, idea, industry, innovation, invention, lightbulb, management, nature, new, planet, power, protection, recycle, renewable, renewable energy, resource, save, saving, science, solar, solution, sustainable, technology, wealth, world,