Coordination divergence of the multi-systems in the Yangtze River Delta and its influencing factors from a coupled carbon reduction perspective

Abstract

Abstract In the context of global warming, urban agglomerations need to consider the coupling degree between the urban environmental system and the urbanization system represented by the "Economic-Social-Housing-Public" systems, in relation to carbon emissions. This is of great importance to support regional carbon reduction. This paper constructs the evaluation index system of urbanization and urban environment system. It analyses the current status and coordination divergence of multi-systems in the Yangtze River Delta region in 2000–2019, using the CRITIC weights method and the coupled coordination model. Then, this paper uses the GeoDetector model to sort out the weights of the indicators affecting the coupled coordination degree and the interactions among the indicators based on the consideration of the geographical characteristics. The results show that: (1) The level of urbanization system, the level of environmental system and the degree of coupled coordination have increased significantly from 2000 to 2019. However, there are large regional differences, with the provincial capital and its periphery clearly different from the peripheral areas. (2) More than economic and ecological indicators. Several indicators of residential and public systems actually have a significant impact on the degree of coupled adjustment. (3) Carbon emissions are found to have an increasing weight on the degree of regional coupled coordination year by year, becoming one of the most important factors in 2019. (4) In terms of influencing factors, coupled coordination is a synergistic effect of several factors. There is an obvious "1 + 1 > 2" relationship between technology and environmental indicators.