Analysis of regional differences and decomposition of carbon emissions in China based on generalized divisia index method

The achievement of China's carbon dioxide (CO 2 ) emission reduction target is of great significance in the face of global climate change. Accurate identification of key factors that affect CO 2 emissions can provide theoretical support to policymakers when designing related policies. Compared to the traditional method, the generalized Divisia index method (GDIM) can capture the influence of multiple scale factors on carbon emissions, providing new tools for studying the decomposition of carbon emissions. The article proposed a GDIM-based decomposition method to analyze the drivers that influence CO 2 emissions in China from 2000 to 2017. The results indicate that investment activity is the primary element in promoting China's carbon emissions, followed by energy use and economic activities. On the contrary, investment carbon intensity is the vital inhibitory factor, followed by GDP carbon intensity. Specifically, the positive driving force of investment and energy use is gradually weakening, while the contribution of economic activities is continuously strengthening. The effectiveness of carbon emission reduction in the Northeast, East, and Southwest is actively promoting China's carbon emission reduction, while the effectiveness of CO 2 emission reduction in the Northwest is not performing well. The findings provide support and reference for carbon emission control in China. • The GDIM is introduced to decompose carbon emissions. • Investment is the core driver leading to carbon emissions growth. • Investment carbon intensity is the primary factor in carbon reduction. • GDP's contribution towards carbon emissions growth is strengthening. • The carbon reduction in Northwest China still need to keep advancing.