Ключевые слова: background, bio, biology, clean, cloud, concepts, conceptual, conservation, development, earth, eco, ecological, ecology, ecosystem, energy, environment, environmental, forests, global, globe, grass, green, growth, hands, life, natural, nature, organic, planet, plants, pollution, preservation, protected, protection, recycle, recycling, reforestation, renewable, responsibility, reuse, save, space, species, sustainability, sustainable, tree, world,