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The vigorous development of the digital economy (DIEC) offers a substantial potential for China and global economies to realize the goal of "double carbon". This study attempts to analyze the heterogeneous effect of DIEC on carbon emission reduction (CERE), in order to extend a valuable reference for effectively achieving the dual-carbon goal. Accordingly, the effect of DIEC on carbon emission scale (CESC) and carbon emission intensity (CEIN) are examined in this paper by using dual fixed effect model and intermediate effect model, respectively. The study findings show that, at first, DIEC significantly supports the CERE while significantly constraining the uplift in CESC and CEIN. Simultaneously, the CERE effect of DIEC contains digital economy dimensional heterogeneity, industry heterogeneity, production and life heterogeneity, and urban-rural heterogeneity. Finally, the DIEC boosts the technological innovation (TEIN) and residents' income (REIN) levels, in order to heighten the CERE. Further, improving invention technology innovation and TEIN is more conducive to catalyzing the reduction of carbon emission in the whole society and the production field. Conversely, the improvement of non-invention technology innovation and rural- and urban residents' income impedes CERE in the field of life. Thus, the implications of this study are of vital significance for China and the rest of the world to foster CERE and achieve the "dual carbon" goal through DIEC development. [ABSTRACT FROM AUTHOR]

Carbon dioxide (CO 2) emissions reduction has become a core task with the goal of "emission peak and carbon neutrality", in which green innovation plays an important role. This paper takes the fast-tracking green patent applications (FGPA) system in China as a quasi-natural experiment to empirically study the impact of green innovation incentive-based policies (GIIPs) on CO 2 emissions in Chinese cities by applying a continuous difference-in-difference approach. The results show that the CO 2 emissions of cities in the treatment group are significantly reduced by about 1.6% after the implementation of FGPA relative to that in the control group. After a series of robustness tests, the conclusion is still valid. Furthermore, the significant negative impact on CO 2 emissions is more reflected in cities located in eastern China, cities with lower financial pressure, and cities with more universities. Overall, this study fills up the gap in the empirical research on the impact of FGPA, and casts a new light on the significant environmental performance of GIIPs. The findings obtained through this study are conducive to strengthening and optimizing the implementation of FGPA, and offering policy-makers with a scientific basis of GIIPs to approach the task of reducing CO 2 emissions. [ABSTRACT FROM AUTHOR]

Controlling carbon emissions and sustaining growth constitute essential concerns in the post-financial crisis era combined with low-carbon sustainable development. However, the impact of financial development on carbon emissions remains controversial and lacks mechanisms investigation covering finance spatial attributes. Relying on China province's data during 2005–2019, this paper contributes to the literature by constructing multi-spatial models to investigate how financial geo-density mitigates carbon emission intensity and explore the spatial transmission mechanisms. The results reveal that there is a balance between financial geo-density and carbon emission intensity. The intrinsic mechanisms include: (1) raising financial geo-density is accompanied by the law of marginal diminishing carbon emission intensity tendency; (2) high financial geo-density accelerates technological innovation and industrial structure upgrading, thereby decreasing carbon emission intensity, but drives industrial-scale expansion, thereby increasing carbon emission intensity; and (3) financial institution competition and inter-industry linkage notably influence the relationship between financial geo-density and carbon emission intensity, promoting the emission reduction effect of financial geo-density in accelerating technological innovation and industrial structure upgrading, and suppressing the emission increase effect of financial geo-density in driving industrial expansion. Our findings provide new insights for developing systemic emission reduction policies for employing financial sectors as catch-all and integrating industries and competition. • Mechanism analysis of financial geo-density affects carbon emission intensity (IC). • Propose an integrated spatial model including spatial mediated moderating effects. • Financial geo-density drives IC by industrial-scale expansion. • Reduce IC by technological innovation and industrial upgrading. • Financial institution rivalry and inter-industry link mitigate total driven effect. [ABSTRACT FROM AUTHOR]