Urbanization is one of the most profound demographic shifts of our time. In 1950, only 30% of the world lived in urban areas. Today, that figure is 57%, and the UN projects it will reach 68% by 2050. Nearly all of this growth is happening in Asia and Africa.

The drivers are economic. Cities concentrate jobs, services, and opportunity. A farmer in rural Bangladesh might earn $2 a day; the same person working in a garment factory in Dhaka might earn $5. That gap pulls people in, generation after generation.

The speed of urbanization is unprecedented in history. China urbanized from 20% to 60% in about 40 years; Britain took 150 years to make the same transition. This rapid pace strains housing, transit, and sanitation, but it also creates enormous economic productivity.

The world now has 33 megacities — urban areas with more than 10 million people. Tokyo (37 million), Delhi (33 million), and Shanghai (29 million) lead the list. By 2030, the number of megacities is expected to reach 43, with most of the new ones in Asia and Africa.

Urbanization is not inherently good or bad. Well-managed cities like Singapore and Copenhagen are engines of prosperity and innovation. Poorly managed cities like Manila and Lagos struggle with slums, traffic, and pollution. The difference is governance, planning, and investment — not the pace of migration itself.