Patrick Gerland, Chief of the Population Estimates and Projections Section of the Population Division of the UN Department of Economic and Social Affairs (UNDESA), briefs journalists on the World Population Prospects 2019: Highlights, at the UN headquarters in New York, June 17, 2019. The world's population is expected to increase by 2 billion in the next 30 years, from 7.7 billion currently to 9.7 billion in 2050, according to a United Nations report released here on Monday. (Xinhua/Li Muzi)