Ключевые слова: arm, background, ball, blue, business, care, color, countries, earth, eco, ecology, environment, environmental, eyeglasses, geography, glasses, global, globe, green, hand, head, human, international, isolated, knowledge, learn, life, lifestyle, map, nobody, ocean, palm, peace, place, planet, protect, protection, recycle, save, scholar, science, security, spectacles, sphere, study, symbol, voyage, warming, white, world,