New Coordinates of Global Urbanization: When Cities Carry 45% of Humanity

The World Urbanization Prospects 2025, released recently by the United Nations Population Division, presents a figure that seems unremarkable yet could become a watershed in the history of civilization: of the global population of 8.2 billion, 45 percent already live in cities. This proportion is more than double that of 1950. For observers accustomed to narratives of linear growth, this is merely another milestone in the process of urbanization; but for those concerned with long-cycle structural change, this figure means that humanity is quietly crossing a critical threshold—cities are no longer a byproduct of industrialization, but rather the core framework shaping global order, economic life, and political space.

Covering 237 countries or regions, with a time span extending from 1950 to 2050, the report provides an authoritative baseline for understanding global urban transformation. Unlike many rough statistics, it distinguishes among urban, town, and rural settlement forms, showing that the city—a high-density form of spatial agglomeration—is expanding at an unprecedented rate. Although the degree of urbanization varies by definition, the fact that "urban population approaches half of the global population" is enough to change traditional understandings of the relationships between city and countryside, center and periphery, and nation and locality.

If one takes a longer view of the arc of human civilization, the historical significance of this transformation becomes even more pronounced. Throughout the long era of agricultural civilization, human settlement patterns were predominantly rural. Over the past two centuries, however, industrialization has triggered large-scale urbanization. The UN report shows that this trend has accelerated sharply over the past seventy years, with the urban share of the population more than doubling, and it is projected to continue until 2050. This means that future international relations, economic growth, and ecological governance will all unfold against a backdrop in which cities serve as the fundamental setting.

The concentration of urban population is not merely a simple change in geographic distribution. It has profoundly altered the mechanisms of knowledge innovation. Cities are places of dense interaction among talent, capital, information, and infrastructure, and this density advantage makes cities incubators of cutting-edge technology, cultural experimentation, and institutional innovation. Over the past half century, the increment of global economic growth has been highly concentrated in metropolitan areas, which precisely reflects this point. However, cities have also exposed their vulnerabilities: high density amplifies the risks of infectious disease, economic volatility, and climate change. Therefore, a 45 percent urban population share is both an opportunity and a responsibility.

From the perspective of the global urban system, urbanization is undergoing a paradigm shift from "Northern dominance" to "Southern rise." The UN report covers the world, including numerous metropolitan areas in Africa, Asia, and Latin America. Although specific growth rates require reference to detailed data, one obvious trend is that future global urban growth will be borne mainly by developing countries. This is not simply a matter of "copying the Western model," but rather a new urbanization path combining different infrastructure, informal economies, and digital technologies. For example, bus rapid transit systems in African cities, high-density public housing in Asian cities, and community-based participatory governance in Latin American cities are all redefining the meaning of urbanization.This diversification means that traditional urban theories, such as "central place theory" or "urban hierarchy systems," can no longer fully explain contemporary global city networks. The connections between cities are increasingly manifested as horizontal links that cross national borders, rather than vertical administrative subordination. From supply chains to data flows, from climate action to migration, cities are increasingly becoming non-state actors in global governance. Many metropolitan councils influence national policy through their own climate commitment lists and even play a role on the international stage. City diplomacy has become another important force following public diplomacy. The tension between national sovereignty and urban autonomy will become one of the core issues in the restructuring of future political systems.

At the same time, urban governance within cities is also facing unprecedented challenges. When cities are home to nearly half of the global population, the provision of basic public goods such as housing, transportation, education, healthcare, and public space is not merely a management issue, but a political issue concerning justice and sustainability. Urbanization does not automatically bring shared prosperity. On the contrary, without planning wisdom and fair distribution mechanisms, urbanization may deepen spatial segregation, social fragmentation, and ecological crises. The value of the UN report lies in the fact that it provides a yardstick for comparing the development levels of various countries and cities, prompting policymakers to shift from "how to grow" to "how to grow better."

For cities, the future strategic direction is no longer simple spatial expansion, but the establishment of more resilient and inclusive spatial structures. As global urbanization enters its second half, competition among cities will shift from comparing population size and skyscraper heights to comparing institutional quality, green indexes, innovation ecosystems, and residents' sense of well-being. As the report shows, urban population growth will not continue indefinitely and has even slowed in some regions, but the potential for improving urban quality remains unlimited.

Throughout history, the fate of cities has been closely linked to the fate of civilizations. From the Agora of Athens to the ward system of Chang'an, from the docks of London to the waterfront of Shanghai, every transformation of urban form corresponds to a reshaping of the global economy and power. Today, when cities have become the home of 45% of humanity, they are no longer merely appendages of the state, but the primary stage for the evolution of civilization. This UN report provides a scientific coordinate for this major transition. It reminds all policymakers, think tanks, and civil society: the future cities we are creating will determine whether humanity can continue to achieve collective progress in this turbulent century.