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This paper uses the number of green patents granted of listed companies and the number of fintech companies in prefecture‐level cities in China from 2011 to 2018 to investigate the impact of fintech development on corporate green technology innovation and its mechanisms. We find that fintech can significantly promote corporate green technology innovation. Specifically, the promotion effect of fintech works through three channels: alleviating financing constraints, gathering scientific and technological talents, and optimizing environmental regulations. Heterogeneity tests find that its promotion effect is more significant for the eastern region, invention patents, state‐owned enterprises, and low environmental uncertainty.

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From the perspective of the institutional environment, this study explores the reasons and mechanisms behind the widening of the economic disparity between China's North and South during the economic development transformation from a factor expansion model to an innovation‐driven model. By defining the institutional environment in terms of the government–market relationship and the non‐state‐owned economy development, the theoretical analysis shows that compared with the South, the government intervenes more in the market and the proportion of state‐owned economy is higher in the North. The differences in the institutional environment are an important reason for the widening of the North–South economic disparity in China during the transformation of China's development model. Taking this transformation after the 2008 international financial crisis as a quasi‐natural experiment, this study constructs a difference‐in‐difference model for empirical testing based on the differences in the regional impact of the economic development model transformation on different institutional environments. It was found that after the economic development model entered the innovation‐driven stage, those regions with a better institutional environment significantly promoted their economic growth. Further mechanism tests have found that innovation capability is an important mechanism for the institutional environment that affects the North–South economic disparity.

Exploring the relationship between economic development and carbon emissions is a hot issue of concern to academia. Taking Chinese cities as the research object, this study constructed an allometric growth model of economic scale and carbon emissions to analyze the spatial–temporal evolution of their allometric growth from 2000 to 2017. Additionally, the geographical detector model was used to reveal the driving mechanism of allometric growth. The findings were as follows. (1) The spatial–temporal patterns of economic scale and carbon emissions were dominated by hot spots. Additionally, their size distribution was in an equilibrium stage. (2) The gap between the economic growth rate of Chinese cities and the growth rate of carbon emissions grew, reflecting the remarkable achievements in carbon emission reduction in Chinese cities as a whole. The scaling exponent declined from east to the west during 2000–2008, but showed the opposite trend during 2009–2017. The proportion of cities with negative allometric growth in the sample cities increased from 76.49 to 97.86%. (3) The influence of city investment intensity, energy utilization efficiency, technological development level, social consumption level, fiscal investment level and economic development level on allometric growth gradually decreases. These factors were also the main factors affecting the spatial–temporal heterogeneity of allometric growth. (4) The impact of various factors had a synergetic enhancement effect. These factors can be classified as economic factors, environmental factors and a combination of them. Under the nonlinear coupling of multiple factors, a spatially differentiated pattern of allometric growth was formed.