数字赋能与城市碳排放——基于下一代互联网示范城市的准自然试验

研究基于2009—2017年中国268个地级市面板数据,将下一代互联网示范城市政策视为准自然实验,利用双重差分模型（DID）实证检验了下一代互联网示范城市政策对城市碳排放的影响。结果表明：下一代互联网示范城市政策对城市碳排放具有缓解作用,可使城市碳排放减少1.41%,该结论在经过稳健性检验后依然成立;在机制分析中得出,下一代互联网示范城市政策主要通过产业结构优化和绿色技术创新的方式缓解城市碳排放;进一步异质性检验表明,下一代互联网示范城市的建设对大型城市和高碳排放量城市的减排效果更加显著,对中小型城市则表现出加剧碳排放的现象。

Digital empowerment and urban carbon emissions: a quasi-natural experiment based on next-generation internet demonstration cities

Based on panel data of 268 prefecture-level cities in China from 2009 to 2017, this study regarded the policy of the next-generation internet demonstration city as a quasi-natural experiment, and empirically tested the impact of the policy of the next-generation internet demonstration city on urban carbon emissions by using the Difference in Difference model (DID). The results show that the policy of the next-generation internet demonstration city can alleviate the carbon emissions of the city, and the carbon emissions of the city can be alleviated by 1.41%. This conclusion still holds after the robustness test. In the mechanism analysis, the policy of the next-generation internet demonstration city mainly alleviates urban carbon emissions through industrial structure optimization and green technology innovation. Further heterogeneity test shows that the construction of the next-generation internet demonstration city has a more significant emission reductions effect on large cities and high carbon emissions, while it aggravates carbon emissions in small and medium-sized cities.