Abstract Based on panel data of 284 cities in China from 2011 to 2021, the paper tested the impact effect, mechanism and heterogeneity of geographical proximity on regional coordinated emission reduction on the basis of scientific measurement of regional coordinated emission reduction levels. The change and convergence analysis of regional coordinated emission reduction level indicates that the overall regional coordinated emission reduction level of China showed a fluctuating upward trend and regional differentiation characteristics of east> middle> west, and it had β convergence. The impact effect test shows that geographical proximity has an inverted U-shaped impact on regional coordinated emission reduction, which promotes first and then suppresses it. And this conclusion is still true after a series of robustness tests. The impact effect of geographical proximity on regional coordinated emission reduction is mainly a promoting effect in the Yangtze River Economic Belt, while it is mainly an inhibitory effect in the non-Yangtze River Economic Belt. Moreover, in high-level cities, the promoting effect of geographical proximity on regional coordinated emission reduction is greater than that in ordinary cities. The mechanism test reveals that geographic proximity can have a nonlinear impact on regional synergistic emission reduction through green innovation division of labor and energy factor mismatch. Based on the above conclusions, policy suggestions are put forward from aspects such as amplifying the positive externalities of geographical proximity, improving the action mechanism, and exerting the positive role of geographical proximity according to local conditions.
2024, Vol. 41 
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