Ключевые слова: abstract, background, blue, care, concept, conservation, day, design, earth, earth hour, eco, ecology, ecosystem, electric, electricity, energy, environment, environmental, event, future, global, globe, green, hand, holiday, hour, innovation, international, life, light, message, modern, natural, nature, night, planet, power, protect, protection, responsibility, save, science, sign, space, switch, symbol, technology, time, world,