Russia's population will shrink by 11 million people by 2050 and will increasingly be concentrated in cities, according to the latest United Nations estimates.
While Tokyo has for some time held the rank of the world's biggest city with its 37 million inhabitants, come 2028 New Delhi is set to take the crown, according to the United Nations Department of Economic and Social Affairs' report, the 2018 Revision of World Urbanization Prospects.
Owing to both demographic shifts and overall population growth, that means that around 2.5 billion people could be added to urban areas by the middle of the century, predicts DESA predicted.
The report found that the global rural population is now close to 3.4 billion, but is expected to decline to 3.1 billion by 2050. India, China and Nigeria will account for 35 per cent of the projected growth of the world's urban population between 2018 and 2050. It now has 31, led by metropolitan Tokyo with 37 million inhabitants.
"The increasing concentration of people in cities provides a way of more economically providing services", he said.
New Delhi will become the world's most populated city around 2028, the report said.
Megacities are those with more than 10 million inhabitants and the reports says a lot of them would be in developing countries.
Currently, Asia is home to 54 percent of the world's urban population, though levels of urbanization are considered to be low in the region.
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However, a few cities in Japan and South Korea - for example, Nagasaki and Busan - have experienced population decline since 2000.
As for rural populations, while they have continued to grow since 1950, it is expected to reach its peak in the next few years, before declining steadily.
Meanwhile, NAIJ.com reported that the National Population Commission (NPC) had put Nigeria's current population at 198 million people with urban population growing at an average annual growth rate of about 6.5%.
"Many countries will face challenges in meeting the needs of their growing urban populations, including for housing, transportation, energy systems and other infrastructure, as well as for employment and basic services such as education and healthcare".
About 90% of the world's rural population live in Africa and Asia.
Understanding the key trends in urbanization likely to unfold over the coming years is crucial to the implementation of the 2030 Agenda for Sustainable Development, including efforts to forge a new framework of urban development.
"However, the challenge is that in many countries it's taking place so rapidly. and large slum areas have developed that are not maybe achieving the goals of sustainable development the way that we would like".