Ключевые слова: background, calendar, chain, community, concept, connected, connection, continent, crowd, day, diversity, earth, eco, environmental, ethnic, friend, friendship, geography, global, globe, graphic, group, growth, hand, holding, human, humanity, international, map, network, partnership, peace, people, planet, population, relationship, save, social, society, support, symbol, team, teamwork, together, togetherness, united, unity, world, world population day, worldwide,