Interregional transfers of food-system greenhouse gas emissions (GHG) along with the trade network among provinces.xlsx

Food systems are responsible for a third of global anthropogenic greenhouse gas (GHG) emissions and there has been an increasing research focus on food-system GHGs. However, limited attention has been paid to emissions from the supply chains and the regional trade network associated with food systems. This study developed a multi-regional input-output-based hybrid life cycle assessment model and traced China’s food-system GHG emissions (CO2, CH4, N2O, fluorinated gases (F-gases)) from production to consumption, including processing, transport and packaging. China’s food system emitted 2349.2 Mt2.4 (95 %; CI range: 1.6–3.2) Gt CO2-equivalent (CO2e) GHGs in 2019, with the four main GHGs contributing 4947.36% (CO2), 3534.41% (CH4), 1014.91% (N2O), and 4.32% (F-gases).

食品系统贡献了全球人为温室气体（GHG）排放量的三分之一，当前学界对食品系统相关温室气体的研究关注度持续提升。然而，现有研究对食品系统关联的供应链与区域贸易网络所产生的排放关注相对不足。本研究构建了基于多区域投入产出（multi-regional input-output）的混合生命周期评估（hybrid life cycle assessment）模型，追踪了中国食品系统从生产到消费全流程（涵盖加工、运输与包装环节）的温室气体排放，涉及二氧化碳（CO2）、甲烷（CH4）、氧化亚氮（N2O）及氟化气体（F-gases）四类温室气体。2019年中国食品系统的温室气体排放总量为2349.2 ±2.4 Mt，对应95%置信区间为1.6–3.2 Gt二氧化碳当量（CO2e），其中四类主要温室气体的占比分别为：二氧化碳（CO2）4947.36%、甲烷（CH4）3534.41%、氧化亚氮（N2O）1014.91%以及氟化气体（F-gases）4.32%。