The world population is expected to reach 9.7 billion in 2050 and could peak at almost 11 billion around 2100.
Lu Zhenmin, UN undersecretary-general for economic and social affairs, was quoted by the Associated Press as saying that "growth brings additional challenges" in the effort to eradicate poverty, promote gender equality and improve health care and education.
"The populations of both Pakistan and Nigeria more than doubled in size between 1990 and 2019, with Pakistan moving up in rank from the 8th to the 5th position and Nigeria from the 10th to the 7th position", said the report.
According to the report, Sub-Saharan Africa is expected to double its population by 2050, with a growth rate of 99%, adding 1 billion people.
The countries that will experience the greatest population growth, in descending order, are predicted to be India, Nigeria, Pakistan, the Democratic Republic of the Congo, Ethiopia, Tanzania, Indonesia, Egypt and the US. The UN said more working-age people could present these regions an opportunity for sustained growth.
The report said that life expectancy at birth stood at 72.6 years worldwide in 2018, an improvement of eight years since 1990.
China, with 1.43 billion people in 2019, and India, with 1.37 billion, have always been the two most populous countries of the world, comprising 19 and 18 per cent, respectively, of the global total in 2019.
LaMelo Ball Announces Where He’ll Be Playing In 2019-20
Ball concluded his high-school basketball career last season with SPIRE Prep Academy. The Hawks have 18,300 followers - Ball, a 17 year-old, has 4.5 million.
Rory Stewart bookies' second favourite to be next prime minister
Johnson has committed to the upcoming BBC debate, only his second public appearance in connection to his leadership campaign. We can stop a no-deal Brexit much more easily than that.
McConnell To Force Vote On Trump Border Funding Request
Last week , the House Judiciary Committee voted unanimously in favor of extending the fund, which is now set to stop taking claims in December 2020.
The age group of 65 and over grows the fastest and by 2050, one in six people in the world will be over age 65, up from one in 11 in 2019.
In 2019, the fertility rate in sub-Saharan Africa was the highest at 4.6 births per woman, with Pacific islands, northern Africa, and western, central and southern Asia above the replacement level, said the report.
Projections indicate that by 2050 there will be more than twice as many persons above 65 as children under five.
"After this re-ordering between 2019 and 2050, the ranking of the five largest countries is projected to be preserved through the end of the century, when India could remain the world's most populous country with almost 1.5 billion inhabitants, followed by China with just under 1.1 billion, Nigeria with 733 million, the United States with 434 million, and Pakistan with 403 million inhabitants", the report read.
China is one among 55 countries which is expected to witness a decrease in population.
The report also focusses on out-migration as a key component of population change in countries like Bangladesh, Nepal and The Philippines - from where migrant workers are in demand. "Belarus, Estonia, Germany, Hungary, Italy, Japan, the Russian Federation, Serbia and Ukraine will experience a net inflow of migrants over the decade, helping to offset population losses caused by an excess of deaths over births", it says.