Coupling coordination development of energy-economy-carbon emissions in China under the background of "double carbon".

The coefficient of variation of the Northwest Economic Zone and the Middle Yellow River Economic Zone has an obvious trend of decreasing and then increasing, and has increased sharply in the past three years, indicating that there is noσ convergence in the coupling coordination degree of the energy-economy-carbon emission system of the Northwest Economic Zone and the Middle Yellow River Economic Zone This may be due to

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The composite score of the carbon emissions system shows a large fluctuation, with an increasing trend before 2014 and a decreasing trend from 2015.

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The Northwest Economic Zone is the region with the largest intra-regional difference in coupling coordination degree among the eight economic zones, showing an overall trend of a sharp decline followed by a sharp rise.

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There is a slight trend of decreasing and then increasing coefficient of variation for the Southwest Economic Zone, indicating that there is no σ-convergence in the coupling coordination degree in the Southwest Economic Zone.

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