数字农科院2.0

Potential decarbonization for balancing local and non-local perishable food supply in megacities

文献类型： 外文期刊

作者： Xintao Lin;Jianping Qian;Jian Chen;Qiangyi Yu;Liangzhi You;Qian Chen;Jiali Li;Pengnan Xiao;Jingyi Jiang

作者机构：

关键词： Carbon neutral;Cold-chain logistics;Food localization;Life-cycle perspective;Urban food system

期刊名称： Resources, Environment and Sustainability

ISSN： 2666-9161

年卷期： 2025 年 20 卷

页码：

收录情况： EI（2025版） ; ; ESCI（2025版）

摘要： Ensuring urban food security while reducing carbon emissions from food systems is a key challenge. Food localization can reduce transport emissions; however, its role in agricultural production emissions reductions is unclear. Here, we explored the effects of localization of seven perishables, incorporating emissions from production and cold-chain logistics, in Beijing and Shanghai, China; determined decarbonization under different scenarios by increasing or decreasing the localization, with or without constrains, of each food category (balancing strategy). The results show that every 1% increase in the localization of vegetables, poultry, and aquatic products decreased 2020 emissions by 0.4–1.9 tCO2e, but for beef and lamb, it increased emissions by 0.2–2.9 tCO2e. Localization decreased cold-chain emission shares for all foods. The balancing strategy with constraints reduced emissions by ∼0.76 MtCO2e (5%) and ∼0.44 MtCO2e (2%) in 2020 in Beijing and Shanghai, respectively. Utilizing urban agriculture at all costs (i.e., without constraints) further reduced emissions by a factor of 3–4. Over 90% of Beijing's emissions added by 2035 under the business-as-usual scenario were projected to be offset by the strategy. In Shanghai, the strategy could reduce emissions by an additional 0.44 MtCO2e. The results indicate that expanding imports of carbon-intensive ruminant meat to replace local production and reallocating urban resources to vegetables, poultry, and aquatic products could lead to more sustainable food supplies in megacities. Further development of cold-chain logistics is expected to reduce emissions in synergy with the balancing strategy. Our results could help inform better food system planning in megacities.

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