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The Duality of Urbanization: Challenges and Solutions for Megacities

과학_환경 2026-04-13 과학/환경

Seoul's morning landscape is always bustling. The subway cars packed with people, the blaring car horns, and the hurried footsteps amidst the crowds all demonstrate how vibrant this city is. However, behind the glittering skyscrapers and dazzling city lights lie complex social and environmental challenges. This is not a problem unique to Seoul. As urbanization rapidly progresses worldwide, this issue is emerging as a common challenge for megacities. A recent study published on LSE Blogs analyzes population density, infrastructure, environmental pollution, and income inequality indices in major megacities globally, presenting the problems and opportunities that arise with accelerating urbanization. According to this research, megacities are engines of economic growth, yet simultaneously hotbeds of inequality and environmental degradation. A 2022 report by UN-Habitat projects that 68% of the world's population will reside in urban areas by 2050, bringing various related issues to the forefront. Currently, the population of South Korea's Seoul Metropolitan Area is approximately 26 million, accounting for about 50% of the total national population. This represents one of the highest concentrations among global megacities, indicating that appropriate population distribution and balanced regional development are emerging as critical challenges. Experts warn that such concentration in the Seoul Metropolitan Area could trigger a 'domino effect,' exacerbating overall imbalances in Korean society. According to 2025 statistics from the Korea Research Institute for Human Settlements (KRIHS), housing price increases due to insufficient housing supply in the metropolitan area, traffic congestion, and imbalances in the job market are accompanied by another crisis: the decline of rural areas. Indeed, between 2020 and 2025, more than half of the 228 cities, counties, and districts nationwide experienced population decline, with many of them classified as areas at risk of extinction. The negative impacts of urbanization are clearly visible in megacities, where economic inequality is pronounced. The LSE study points out that the income inequality index (Gini coefficient) has been steadily rising in most megacities, identifying it as one of the main factors undermining urban sustainability. In particular, the sharp rise in housing costs is pushing the middle class to the outskirts of urban centers, leading to deeper social segregation and class stratification. Tokyo and Seoul, two of Asia's largest megacities, face remarkably similar problems. An analysis published in Aeon indicates that Tokyo is also experiencing skyrocketing housing prices due to high population density, and the gap between social classes is widening. According to 2024 statistics from the Tokyo Metropolitan Government, the average housing price in the three central wards (Chiyoda, Chuo, Minato) is more than three times higher than in outer areas, and this disparity is expanding annually. In contrast, Scandinavian cities are noteworthy for significantly curbing urban inequality through income redistribution policies. In Stockholm, Sweden, public housing accounts for approximately 40% of the total, ensuring housing stability for low-income residents through a differentiated rent policy based on income levels. Copenhagen, Denmark, prevents social segregation by designing its urban plans from the outset to consider 'social mix,' allowing high-income and low-income residents to live in the same areas. These examples suggest directions for South Korea's megacities to pursue. An Aeon essay titled 'The Giant Organism Made by Humans: The Philosophical Meaning of Megacities' goes beyond a mere statistical approach to explore the psychological and cultural impacts of megacities on human life and identity. The author describes megacities as 'the most complex organisms created by humans,' questioning how these colossal structures affect individual identity, sense of belonging, and happiness. In megacities, people experience the paradox of feeling profound isolation even while living among millions. This reveals a fundamental problem that goes beyond mere physical space, pointing to the weakening of human relationships and community spirit. Statistics showing that Seoul's single-person household ratio exceeded 34% as of 2025, with a significant portion experiencing social isolation, support this phenomenon. **Signs and Major Challenges of Unsustainable Urbanization** Furthermore, megacities are not immune to environmental problems. Environmental pollution is rapidly accelerating due to urbanization, with air quality and waste management emerging as major challenges. According to a 2024 report by the C40 Cities Climate Leadership Group, major megacities worldwide account for approximately 70% of global greenhouse gas emissions, underscoring the importance of efficient urban space utilization. South Korea is also not free from issues like fine dust, and the concentrated ind