2025年世界城市化展望报告_124页_5mb

World Urbanization Prospects 2025 Summary

Core Content

The World Urbanization Prospects 2025 report, published by the United Nations Department of Economic and Social Affairs (UN DESA) Population Division, provides comprehensive estimates and projections of urbanization trends for 237 countries and areas, as well as over 12,000 urban settlements with 50,000 inhabitants or more. The report introduces a new harmonized Degree of Urbanization methodology that integrates geospatial data with national definitions, enhancing international comparability and policy relevance.

Main Points

Urban Population Growth

• Urban population has grown significantly since 1950, with 45% of the world's 8.2 billion population now living in cities.
• Towns account for 36% of the global population, and rural areas for 19%, reflecting a global shift towards urban living.
• By 2050, two-thirds of population growth is expected to occur in cities, with the remainder in towns, while the rural population is projected to peak in the 2040s and then decline.

Megacities

• The number of megacities (cities with 10 million or more inhabitants) has quadrupled from 8 in 1975 to 33 in 2025.
• Asia hosts 19 out of 33 megacities, and over half of all megacities are expected to be in Asia by 2050.
• Jakarta, Dhaka, and Tokyo are the top three most populous cities in 2025, with Jakarta being the largest at nearly 42 million.
• Dhaka is projected to become the world's largest city by mid-century, while Tokyo may fall to seventh place by 2050.

Urbanization Patterns

• Small and medium-sized cities account for more than half of the global urban population, and many are among the fastest-growing settlements, especially in Africa and Asia.
• Urban population growth is uneven, with over 3,000 cities experiencing population decline between 2015 and 2025, particularly in China and India.
• Population density has increased for about half of the world's cities, indicating urbanization trends and potential challenges related to crowding or sprawl.

Towns and Rural Areas

• Towns are home to over a third of the global population and play a critical role in sustainable development.
• Rural areas are expected to decline in number and population, with sub-Saharan Africa being the only region where rural populations have grown significantly in recent decades.
• Rural communities face challenges such as population aging and out-migration, emphasizing the need for urban-rural linkages to reduce disparities.

Built-Up Areas

• The built-up area globally has expanded nearly twice as fast as the population since 1975, with per capita built-up area increasing from 43 to 63 square meters.
• Europe, Northern America, Australia, and New Zealand have the highest built-up area per capita, while Central and Southern Asia have the lowest.

Key Messages

• Urbanization is one of the most significant demographic shifts in human history, reshaping how and where people live, work, and build communities.
• Towns are essential for sustainable development and should be integrated into urban planning strategies.
• Rural areas face unprecedented challenges, including aging populations and migration, requiring attention to maintain essential services and reduce regional disparities.
• The Degree of Urbanization methodology provides internationally comparable data, highlighting that the world is more urbanized than national statistics suggest.
• Integrated planning across cities, towns, and rural areas is crucial for sustainable development and environmental protection.

Methodology and Data Sources

• The report uses geospatial methods and national definitions to estimate and project urbanization.
• National statistical offices and the Joint Research Centre (JRC) of the European Commission contributed to the development of the dataset.
• The UN Population Division acknowledges the collaboration with various international bodies to ensure accuracy and consistency.

Policy Implications

• Urban policies must address both growth and decline in city populations.
• Sustainable urban development requires planning that considers the interdependence of cities, towns, and rural areas.
• Improved data collection and geospatial integration are essential for effective urban planning and policy-making.
• Support for rural infrastructure and smallholder agriculture can help balance urban-rural development and promote inclusive growth.

Conclusion

The World Urbanization Prospects 2025 underscores the complex and dynamic nature of urbanization globally. It emphasizes the need for context-sensitive policies that address the interconnectedness of urban and rural areas, and highlights the importance of data in shaping sustainable development strategies. The report serves as a valuable resource for policymakers, researchers, and practitioners working on the 2030 Agenda and New Urban Agenda.