Unveiling the mechanisms and pathways toward sustainable urban human settlements in post-industrial regions: an SDG-based assessment of coupling coordination and obstacle factors in Northeast China

Every city is more than a collection of buildings and roads; it is a living system where people, the economy, and the natural environment constantly interact. When these three elements work in harmony, a city thrives, offering its residents safety, opportunity, and a healthy place to live. When they clash, the result is a place where growth stalls, services fail, and the environment suffers. For decades, scientists and planners have tried to measure how well these systems are working together, especially in regions that have struggled to adapt after the decline of their traditional industries. The United Nations has provided a global roadmap for this challenge, outlining seventeen broad goals for a better future, from ending poverty to protecting the planet. Researchers now use these goals as a checklist to see if cities are truly moving toward a sustainable future or if they are merely surviving.

In the vast, cold expanse of Northeast China, a region once defined by heavy industry and now navigating a difficult transition, a team of researchers set out to understand exactly how these urban systems are evolving. They focused on thirty-four cities across three provinces, looking at a twenty-three-year period from 2000 to 2023. Their goal was not just to count how many parks or hospitals existed, but to see how the economic engine, the social safety net, and the natural environment were dancing together—or tripping over one another. By building a detailed map of these interactions, they hoped to uncover why some cities are flourishing while others remain stuck, and to identify the specific hurdles that are holding the entire region back.

The researchers began by constructing a comprehensive scorecard for each city, drawing on data ranging from government spending and internet access to air quality and green space. They found that over the last two decades, the overall quality of life in these cities has improved steadily. The score they developed, which measures the health of these human settlements, rose by nearly 74 percent from the start of the century to the present day. However, this progress was not spread evenly across the landscape. A clear pattern emerged: the southern cities, particularly those near the coast, are far ahead, while the northern and inland areas lag behind. The coastal city of Dalian and its neighbors have long led the way, leveraging their ports and trade to build strong, resilient communities. In contrast, cities in the far north and those dependent on dwindling natural resources have struggled to keep pace, often remaining in a state of stagnation despite the region's overall gains.

When the team looked closer at how the different parts of these cities interact, they discovered a complex story of partial success. The economic, social, and environmental systems are now working together much more closely than they did in 2000, reaching a level of high interaction. Yet, the harmony between them is still fragile. The region has reached a stage of "primary coordination," meaning the systems are moving in the same direction but are not yet fully synchronized. The environment has actually improved significantly, with better air quality and more green spaces, largely because heavy industry has scaled back. However, this environmental progress has not been matched by equal gains in the economy or social services. The region is like a car with a new, efficient engine but a worn-out transmission; the parts are there, but they are not shifting gears smoothly enough to drive forward at full speed.

The most significant finding of the study lies in identifying what is actually stopping these cities from reaching their full potential. The researchers used a method to pinpoint the specific factors that act as the heaviest anchors on progress. They found that the biggest barriers are not the physical environment, which has improved, but rather the social and economic realms. Specifically, the lack of investment in science and technology, the shortage of books in public libraries, limited access to high-speed internet in homes, and insufficient park space per person are the primary obstacles. These are not just minor inconveniences; they represent a gap between what residents need for a modern, connected life and what the cities are currently providing. The data shows that while basic needs are being met, the demand for high-quality cultural services, digital connectivity, and innovation is outpacing the supply.

This analysis reveals that the path forward for Northeast China requires a shift in focus. The region has successfully cleaned up its environment and stabilized its infrastructure, but it now faces a new challenge: upgrading the "software" of its cities. The study suggests that future growth depends on closing the digital divide, investing in cultural institutions, and diversifying the economy beyond traditional industries. The researchers emphasize that a one-size-fits-all approach will not work; the coastal cities need to upgrade their existing strengths, while the struggling northern cities need targeted support to prevent them from falling further behind. By understanding these specific bottlenecks, policymakers can move beyond general improvements and address the precise factors that are keeping these communities from achieving a truly sustainable future.