Study on the decoupling relationship of energy-related CO2 emissions and economic growth in China: Using the new two-dimensional decoupling model

•A new Two-dimensional decoupling model was constructed.•The static and dynamic two-dimensional decoupling state of China’s 30 provinces from 2000 to 2019 was analyzed.•The decoupling state of economic growth and CO2 emissions of 30 provinces was discussed in two decoupling models.