Ключевые слова: background, blue, business, care, concept, conceptual, conservation, day, development, earth, eco, ecology, ecosystem, energy, environment, environmental, forest, global, globe, green, hand, hold, holding, hope, human, isolated, leaf, life, light, man, map, nature, peace, people, planet, plant, protect, protection, recycling, safety, save, science, sphere, sustainable, symbol, technology, tree, world,