Ключевые слова: abstract, background, bright, change, city, climate, concept, conservation, day, design, earth, ecology, ecosystem, efficiency, electric, electricity, energy, environment, event, felttip, future, global, globe, greeting, handwriting, heart, hour, international, life, light, march, message, modern, nature, object, off, paper, pen, planet, plannet, power, save, sign, symbol, text, time, turn, turnoff, word, world,