Nigeria's population will increase by 189m between 2018 - 2050 - United Nations forecast

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According to the report, by 2050 two-thirds of people in the world will be living in cities and will be mainly concentrated in three countries - India, China, and Nigeria.

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.

The Guardian reports that now, 55 percent of the world's population resides in urban areas and this will increase to about 68 percent in 32 years. Shanghai is home to 26 million, Mexico City and Sao Paulo follow with 22 million each and then, Cairo, Mumbai, Beijing and Dhaka all have close to around 20 million people living there. It now has 31, led by metropolitan Tokyo with 37 million inhabitants.

Among other findings, the report said in 1990 there were just ten megacities with populations of 10 million or more.

By 2030, the world is projected to have 43 megacities with more than 10 million inhabitants, a lot of them in developing regions.

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"By 2020, Tokyo's population is projected to begin to decline, while Delhi is projected to continue growing and to become the most populous city in the world around 2028", the report said, according to Press Trust of India. Asia, despite its relatively lower level of urbanization, is home to 54 percent of the world's urban population, followed by Europe and Africa with 13 percent each. In related news, cities like Nagasaki and Busan have experienced a significant decline in their population since the start of the 21st century.

The chairman of NPC, Eze Duruiheoma, stated this in NY while delivering Nigeria's statement on sustainable cities, human mobility and worldwide migration at the 51st session of commission on population and development.

The rural population of the world has grown slowly since 1950 and is expected to reach its peak in a few years.

Population Division director John Wilmoth said: "When urban growth is rapid, insuring access to housing, water, sanitation, electricity, public transport, education and health care for all is especially challenging".

Meanwhile, 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%. Africa and Asia are home to almost 90% of the world's rural population in 2018. There are now 33 megacities and by 2030, 43 megacities are projected, mostly in developing countries.