Regional Integration, Technological Innovation, and Digital Economy: Evolution and Evidence of the Decarbonization Driving Forces in the Yangtze River Delta

Economic decarbonization has gained attention as a viable way to achieve carbon neutrality without sacrificing high-quality economic development. Regional integration (RI), technological innovation (TI), and the digital economy (DIE) are important decarbonization driving forces. To analyze how they impact carbon reduction and the evolutionary patterns observed in urban development, this study focuses on the urban agglomeration of the Yangtze River Delta (YRD) and uses the spatial Durbin model (SDM) to decompose the carbon reduction effects into spatial spillover effects and short-term and long-term effects. The research findings include the following: (1) The decarbonization driving forces have promoted economic decarbonization in the YRD and exhibit distinct evolutionary patterns. (2) The decarbonization effects exhibit spatiotemporal heterogeneity depending on the economic situation, period, and energy status of the cities. Over time, TI and DIE demonstrate better decarbonization effects. Economically developed cities are more likely to expand their carbon reduction advantages, while cities with dense energy supplies struggle to achieve their full carbon reduction potential due to traditional energy structures. (3) Industrial structure upgrading (UIS) is a critical pathway through which TI and DIE reduce carbon emissions. These findings enrich existing research on decarbonization drivers and offer valuable insights for governments to formulate further policies for economic decarbonization.