Ключевые слова: alternative, background, battery, bulb, business, chemical, clean, concept, creative, development, earth, eco, ecological, ecology, economical, electric, electricity, energy, environment, environmental, friendly, future, generator, glass, global, green, growth, idea, industrial, industry, innovation, landscape, leaf, light, lightbulb, natural, nature, plant, power, protection, recycle, renewable, resource, save, solar, sustainability, sustainable, symbol, technology, tree,