| Summary: | This paper investigates the relationship between port productivity and carbon dioxide (CO<sub>2</sub>) emissions in port cities. The study initially employs the global Malmquist productivity index (MPI) to measure productivity growth in 16 major inland ports along the Yangtze River, obtaining data on the ports’ total factor productivity (TFP). Through an analysis using the panel data model with two-way fixed effects, we find a positive correlation between the improvement of port TFP and the increase in CO<sub>2</sub> emissions in port cities. Further panel quantile regression analysis reveals the heterogeneity of this impact, especially in cities with medium and higher CO<sub>2</sub> emissions, where the positive effects of TFP on carbon emissions are particularly significant. The study also indicates a threshold effect of port size in the relationship between TFP and CO<sub>2</sub> emissions: in smaller ports, the impact of TFP improvement on CO<sub>2</sub> emissions is less significant; however, once the port size exceeds a certain threshold, the growth in TFP significantly promotes an increase in CO<sub>2</sub> emissions. These findings provide theoretical justification and decision-making references for policymakers to adopt effective measures to mitigate the growth of CO<sub>2</sub> emissions while promoting the efficiency of port production.
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