Ключевые слова: agriculture, animal, background, bio, care, child, clean, concept, conservation, day, design, development, earth, earth day, eco, ecological, ecology, ecosystem, energy, environment, environmental, family, forest, fresh, friendly, global, globe, grass, green, growth, hand, human, leaf, life, man, natural, nature, organic, people, planet, plant, protect, protection, save, seedling, spring, sustainable, symbol, tree, world,