Ключевые слова: africa, america, background, care, concept, conservation, day, development, earth, eco, ecology, energy, environment, environmental, europe, friendly, geography, global, globe, grass, green, hand, hands, heart, hold, holding, human, life, love, map, nasa, nature, new, ocean, planet, plant, protect, protection, recycle, recycling, save, space, sustainability, sustainable, symbol, usa, water, world,