立足于中国城市数智化转型和绿色低碳发展的新时代背景，基于2007—2022年277个城市的面板数据，以“宽带中国”和“智慧城市”双试点政策作为准自然实验，采用多期双重差分法对城市数智化转型的碳减排效应进行检验。实证分析表明：相较于非试点城市和单试点城市，“宽带中国”和“智慧城市”双试点城市具有更强的碳减排协同效应，说明城市数智化转型可以促进绿色低碳发展，该结论经过多种稳健性检验后仍然成立。其中，城市数智化转型主要通过优化产业结构、资源合理配置、促进技术创新等途径发挥其碳减排效应。进一步研究发现：数智化转型的碳减排效应因地理区位、资源禀赋和发展水平等城市特征的不同而不同。此外，双试点政策的碳减排效应具有逐年增强的趋势，且该效应并不以牺牲经济增长为代价。

Against the backdrop of China’s urban digital-intelligent transformation and the pursuit of green and low-carbon development in the new era, this study employs the panel data from 277 cities spanning 2007 to 2022 to examine the carbon reduction effects of urban digital-intelligent transformation. A Multi-period Difference-in-Differences (DID) approach is adopted by using the dual pilot programs of Broadband China and Smart City as a quasi-natural experiment. The empirical results indicate that compared with non- pilot and single-pilot cities, the dual pilot cities of “Broadband China” and “Smart City” exhibit stronger synergistic effects in carbon reduction. This finding demonstrates that urban digital-intelligent transformation contributes to green and low-carbon development, a conclusion that remains robust across multiple tests. The mechanism analysis further reveals that the carbon reduction effect of digital-intelligent transformation operates primarily through industrial restructuring, more efficient resource allocation, and the promotion of technological innovation. Heterogeneity analysis shows that the magnitude of this effect varies with urban characteristics such as geographic location, resource endowment, and level of development. Moreover, the carbon reduction effects of the dual pilot programs have strengthened over time and are achieved without sacrificing economic growth.

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国家社会科学基金重点项目（24AZD074）