The embodied CO2 transfer across sectors of cities in Jing-Jin-Ji region: combining multi-regional input–output analysis with complex network analysis

Abstract

The CO₂ emission transfer at city level, especially across sectors of cities, has not yet been sufficiently quantified. This paper analyzes the embodied CO₂ transfer across sectors of 13 cities in Jing-Jin-Ji region (Beijing–Tianjin–Hebei in China) combining multi-regional input–output analysis with complex network analysis. The results show that (1) most embodied CO₂ transfers are concentrated in a few sectors and emission reduction effects on these sectors can be quickly extended to the entire embodied CO₂ transfer network (ECTN). (2) The electricity and hot water production and supply sector in Beijing have the most embodied CO₂ export partners and the strongest control over embodied CO₂ transfer. The construction sector in Beijing has the most embodied CO₂ import partners and greatest influence on the ECTN. (3) At city level, 90% of embodied CO₂ transfers occur within the city, and the general direction of embodied CO₂ transfer across cities is from resource-rich cities, Tangshan and Handan, to developed cities, Beijing and Tianjin. At sector level, the largest embodied CO₂ transfer path is electricity and hot water production and supply → metallurgy → construction sector. (4) Embodied CO₂ transfers of sectors in the same or adjacent cities are denser. Collection of sectors in Beijing and Tianjin is the densest embodied CO₂ transfer community.