Coupling coordination degree between coal production reduction and CO2 emission reduction in coal industry

The decline in coal production and the increase in low-carbon production levels are both important manifestations of the industry's elimination of backward production capacity. To test the benign interaction between the "quantity" and the "quality", this paper takes 12 provinces in China with significant reductions in coal production, calculates and compares the changes in the coupling coordination degree (CCD) of the two systems from 2000 to 2019, and explore the key factors that affect CCD. The results show that from 2013 to 2019, 12 provinces have seen a decline in coal production between 5% and 23.6%, and the effectiveness of coal production control is relatively significant. However, the carbon emission reduction efficiency of the coal industry in 9 of these provinces has been at a lower level with a mean value of 0.481. After 2013, the CCD of 12 provinces significantly improves and the two systems have converged to a good state of coordination (Dit>0.6) in most provinces by 2019. However, the high volatility of CCD after 2013 suggests the instability of interaction. LnPGDPPEPOV, and FDI are proven to be the key factors affecting the system coordination. Meanwhile, other factors need to be further explored and improved.