Ключевые слова: air, bulb, carbon, change, clean, climate, concept, conceptual, cost, earth, eco, ecology, editorial, electricity, emission, energy, fuel, global, green energy, growth, idea, illustrative, increase, innovation, lamp, letter, light, low, metaphor, mirror, natural, photovoltaic, plant, plug, power, price, protection, recycling, reflection, renewable, resources, saving, scrabble, solar, symbol, technology, warming, wooden, word, world,