Ключевые слова: abstract, background, bio, care, city, concept, conservation, day, development, earth, earth day, eco, ecology, economy, electric, electricity, energy, environment, environmental, global, globe, growth, hand, holding, hope, hot, human, inspiration, investment, light, nature, night, palm, people, planet, pollution, power, protection, recycle, safety, save, science, sign, solar, solution, support, symbol, technology, warning, world,