Research on the Measurement and Countermeasures of Marine Green Economy Efficiency in China under the Background of “Double-Carbon”

Aims: It is of great significance to China to realize the green and sustainable development of Marine economy in the process of continuously and steadily promoting the practice of reaching carbon peak and carbon neutrality. In recent years, the measure of Marine green economy efficiency has attracted wide attention from academic circles. Methodology: Under the dual perspective of environmental constraints and government governance, this paper will, based on the panel data of 11 coastal provinces in China from 2004 to 2019, use the ultra-efficiency SBM model to measure the efficiency of Marine green economy in 11 coastal provinces in China, and conduct a static effect analysis. At the same time, the traditional DEA model is adopted to calculate the Marine economic efficiency without considering the unexpected output and resource input, and the two calculation results are compared and analyzed. Conclusion: (1) the overall efficiency level of Marine green economy in China is not high; (2) the undesired output has obvious influence on the efficiency value of Marine green economy, and the resource and environmental constraints will cause a certain degree of resource loss; (3) due to the economic development level and regional differences in different provinces, some provinces improve the Marine economic efficiency by sacrificing the environment. Finally, based on the above conclusions, targeted suggestions are put forward for the development of China's Marine economy to develop the Marine economy and accelerate the construction of a maritime power.