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• The GTFP growth is calculated using a three-stage DEA dynamic analysis model. • An asymmetric spatial weighting matrix is constructed. • The temporal-spatial evolution of GTFP growth in China's coastal cities is explored. • The relevant policy implications are provided. Coastal cities are the strategic core areas of China's economic growth. Measuring and understanding green total factor productivity (GTFP) growth in coastal cities is an essential prerequisite for achieving high-quality development (HQD). This paper aims to measure the accurate GTFP growth of China's coastal cities and grasp its temporal-spatial evolution. First, a three-stage dynamic analysis model is constructed to calculate the accurate GTFP growth with the effects of external environmental factors and random errors eliminated. In the context of the "3060" double carbon target, carbon reduction poses a challenge to the HQD of the coastal cities. To measure GTFP growth under the carbon emission constraints, carbon emissions are considered as one of the undesired outputs. On this basis, the temporal-spatial evolution of the GTFP index and its spatial effects are further explored using kernel density estimation and spatial Markov chains. The empirical results show that: (i) The adjusted GTFP index after eliminating the effects of environmental factors and random errors is significantly different from the original results. The GTFP index of coastal cities is underestimated without eliminating the effects of environmental factors and random errors. (ii) There are significant differences in the regional distribution of GTFP growth in coastal cities, with cities with faster GTFP growth gathering production factors from adjacent cities and causing a siphon effect. Finally, policy recommendations related to these findings are given. [ABSTRACT FROM AUTHOR]

The aim of the paper is to evaluate empirically the main implications of digital technology (DT) on carbon emissions (CE). Our sample focuses on 283 cities of China over the period from 2003 to 2019, and the effect of DT on CE is examined with a threshold spatial effect model. Empirical results show that DT has a negative impact on carbon emissions and the transmission mechanism contains both a direct impact on local region and a spillover effect across regions. There is empirical evidence of a threshold effect in the relationship between DT and CE, with stronger carbon reduction effect for DT values larger than the established threshold. Moreover, CE reduction effect of DT appear to be amplified by the level of marketization. Regions with a higher level of marketization thus show a more significant manifestation of CE reduction effect attributed to DT. Our results provide empirical evidence that DT development may contribute to achieving carbon neutrality at least partially. [ABSTRACT FROM AUTHOR]