给定一段英文文本，将文本翻译成中文。
以下是一段英文新闻报道的全文:

"The United Nations has predicted that the world population will reach 9.7 billion by 2050, an increase of almost 2 billion people from the current population of 7.8 billion. The majority of this growth is expected to occur in developing countries, particularly in Africa, which is projected to double its population by 2050. This population growth will pose significant challenges for the world in terms of food security, environmental sustainability, and economic development."
联合国预测，到2050年，全球人口将达到97亿，比目前的78亿人口增加近20亿人。预计大多数增长将发生在发展中国家，特别是在非洲，到2050年，非洲的人口预计将翻倍。这种人口增长将在粮食安全、环境可持续性和经济发展方面给世界带来重大挑战。