## 4 Results
### Results of Spatiotemporal Evolution Analysis
#### 4.4.2 Spatial Variation Results
This persistently high level of disparity reflects significant structural imbalances in the coordinated development of green technology innovation and carbon reduction in the eastern region, which may stem from the heterogeneity in the technological diffusion capabilities and industrial transformation processes among provinces within the region, particularly the existing siphoning effect. In contrast, the central and western regions exhibit a higher degree of intra-regional homogeneity, with average G values of 0.036 and 0.034, respectively. Notably, in the western \begin{table}
\begin{tabular}{c c c c c} \hline
**Year** & **Eastern Region** & **Central Region** & **Western Region** & **Northeastern Region** \\ \hline
2013 & 0.118 & 0.047 & 0.051 & 0.095 \\
2014 & 0.115 & 0.037 & 0.046 & 0.073 \\
2015 & 0.109 & 0.030 & 0.050 & 0.063 \\
2016 & 0.104 & 0.049 & 0.028 & 0.061 \\
2017 & 0.106 & 0.040 & 0.029 & 0.051 \\
2018 & 0.102 & 0.038 & 0.031 & 0.042 \\
2019 & 0.095 & 0.021 & 0.025 & 0.042 \\
2020 & 0.092 & 0.028 & 0.024 & 0.040 \\
2021 & 0.093 & 0.038 & 0.023 & 0.040 \\ Average & 0.104 & 0.036 & 0.034 & 0.056 \\ \hline \end{tabular} Note: Eastern Region represents the eastern region; Central Region refers to the central region; Western Region denotes the western region; and Northeastern Region signifies the northeastern region.  
\end{table} 
Table 4: Analysis of differences within subgroups by region. Figure 6: Distribution of differential contributions of four major areas based on Dagum Gini coefficient data. region, the G value significantly decreased from 0.051 in 2013 to 0.023 in 2021, showing the most pronounced convergence trend. This sustained convergence of intra-regional disparities may be attributed to a series of collaborative innovation policies implemented in the western region under the national strategy for coordinated regional development. In contrast, the northeastern region exhibits unique evolutionary characteristics, with its G value dropping substantially from 0.095 in 2013 to 0.040 in 2021, yielding an average value of 0.056. This significant downward trend indicates that, despite facing pressures for industrial transformation, the intra-regional consistency in green and low-carbon development is gradually strengthening. The revitalization strategy for the northeast has shown certain effectiveness. Further analysis reveals that Table 5 shows the differences in the coordinated development of RGTI, NQP, and CRCI among the subgroups of the four major regions of China from 2013 to 2021. Empirical results indicate that the differences between the eastern region and other regions are significantly greater than those among other regional combinations; in particular, the average difference value between the eastern and northeastern regions reached 0.156, exhibiting the most significant regional differentiation characteristics. Specifically, the eastern-northeastern difference decreased gradually from 0.183 in 2013 to 0.149 in 2021. Although this shows a converging trend, it remains at a relatively high level. This persistent high level of disparity reflects the significant advantages of the eastern region in terms of green technology innovation capabilities and industrial transformation efficiency. In contrast, the northeastern region, as a traditional industrial base, faces significant challenges in the green transformation process and experiences a siphoning effect. The differences between the eastern-central and eastern-western regions also remain at high levels, with average values of 0.131 and 0.141, respectively. Notably, these two sets of differences exhibit distinct evolutionary characteristics over the study period: the eastern-central difference decreased from 0.141 to 0.130, while the eastern-western difference remained relatively stable, decreasing from 0.153 to 0.136. In contrast, the average difference values for the central-western, central-northeastern, and western-northeastern regions are significantly lower than those with the eastern region and exhibit a continuously converging trend.