Seiyong Kim

As climate issues become more severe, the necessity and importance of urban transformation are being widely recognized, and the breadth and depth of research in various disciplines of social sciences to promote net-zero carbon (NZC) transformation in cities is increasing. In this study, between 2015 and 2021, 17 major cities and administrative regions in Korea from were taken as the target and based on the driving force-pressure-state-impact-response (DPSIR) model, a framework of 23 indicators of energy, environment, and economic systems (3ES) was constructed through the coupling coordination degree (CCD) assessment system. The development level, development speed, coordination index of subsystems, and coupled coordination relationship were analyzed successively. Finally, a gray correlation model was adopted to extract the 3ES of each city and their key driving factors. The findings indicate that: (1) There is a phenomenon of high coupling and low coordination within the subsystem, with the environmental factors layer being the most critical concern. (2) The overall coupling of the system has improved continuously since 2015, but it is still at the moderate coupling stage, owing to the long-term nature of system contradictions and processing lags. (3) The driving causes of urban transformation have shifted from economic to environmental restrictions, resulting in noticeable regional differences later in the study period and a rise in the necessity for hierarchical zoning governance. Finally, based on the perspective of restricted subsystems and the consolidation of the 3ES coordination relationship, this study demonstrates the significant relationship between environmental protection, energy transition, and economic development, thus enriching the associated literature at the periphery. It also provides a theoretical foundation for investigating the transition path of NZC cities, thus enhancing research in this area.

Through quantitative and qualitative analysis, this report conducts a thorough evaluation of the literature on the present progress in research on and the performance of net-zero-carbon cities (NZCCs). The quantitative analysis identifies ten major areas at this stage, and this analysis is followed by a systematic review of the dynamics and cutting-edge issues of research in the hot literature in this area. The systematic review reveals that the key points of NZCC transformation at this stage are research on zero-carbon buildings, urban paradigms, policies, economics, and renewable energy. Finally, based on the results of the previous analysis, to build the theoretical framework of NZCCs and combined with the sustainable development goals, future research directions are proposed, such as urban infrastructure transformation and low-carbon transportation, policy support and system reform, and digital transformation as well as coupling and balancing the relationships of various elements. In addition, cities need to develop evaluation indicators based on specific developments, and policy adaptability and flexibility are crucial for promoting cities’ efforts to achieve zero emissions. The current study provides targeted theoretical references and assistance for future policymakers and researchers, as well as advances and trends in the field of net zero carbon and associated research material from an urban viewpoint.

Providing sustainable public housing solutions is one of the major challenges for countries with emerging economies. Based on the panel data of eight metropolitan cities in South Korea from 2017 to 2021, this study uses the entropy value method and coupling coordination model to evaluate the quantitative interaction between the life-cycle and the public housing systems, followed by the OLS regression model to explore their level of coupling coordination and its influencing factors. The findings reveal the following: (1) The support of public housing welfare by the life cycle had previously been effective in alleviating housing conflicts. (2) The main evaluation values of the indicators had their focus shifted from the quantitative supply to the growth of households, housing cost affordability, and housing size. (3) Overall, the average level of coupling and coordination among Korean cities has risen substantially, but the development of the public housing system still lags behind the change in the life cycle of each city’s composite index. As a result, policymakers should reasonably allocate policies by focusing on their long-term benefits. (4) The supply for emerging families, infrastructure allocation, and the affordability of housing are important factors for improving the level of coordination that should be considered.