Propensity score matching estimation.

Achieving the United Nation’s 2030 agenda which aims, among other goals, to ensure sustainable consumption and production patterns, requires a sustainable resource use model deployed at scale across global food systems. A circular bioeconomy (CBE) model of resource use has been proposed to reuse of organic waste in agricultural production to enhance food security. However, despite several initiatives recently introduced towards establishing a CBE in sub-Saharan Africa (SSA), minimal scientific efforts have been dedicated to understanding the association of CBE practices and food security. This study use data from 777 smallholder farm households from DRC, Ethiopia, Rwanda, and South Africa, to examine associations between three CBE practices (use of organic waste as compost, as livestock feed, and sorting waste) and household food security. Using different regression and propensity score matching models (PSM). Result reveal that using CBE practices more likely adds a 0.203 score of food insecurity access prevalence (HFIAP), 1.283 food insecurity access scale (HFIAS-score) and 0.277 for household dietary diversity score (HDDS) among households using CBE practiced groups. Associations regarding using organic waste as compost are generally positive but insignificant, while those with sorting waste are significantly and consistently negative. Thus, CBE innovations aiming to enhance household food security could prioritize organic waste valorization into livestock feed consider socio economic aspects such as access to land, access to market, education level, using mobile phone, income and city regions where interventions took place. However, prior sorting of waste is necessary to enable effective waste valorization.

为实现联合国2030年议程——其核心目标之一是保障可持续消费与生产模式——需在全球粮食系统中规模化推广可持续资源利用模式。现有研究提出了循环生物经济（Circular Bioeconomy, CBE）资源利用模式，旨在将有机废弃物应用于农业生产环节以提升粮食安全水平。然而，尽管近期已有多项旨在撒哈拉以南非洲（sub-Saharan Africa, SSA）推广CBE的举措落地，但学界针对CBE实践与粮食安全之间关联的研究仍极为有限。本研究采用来自刚果民主共和国（Democratic Republic of the Congo, DRC）、埃塞俄比亚、卢旺达以及南非的777户小农家庭数据，探究三类CBE实践——即有机废弃物堆肥、用作畜禽饲料以及废弃物分选——与家庭粮食安全之间的关联，并采用多种回归模型与倾向得分匹配模型（Propensity Score Matching, PSM）开展分析。研究结果表明，在采用CBE实践的农户群体中，粮食不安全状况发生率（Household Food Insecurity Access Prevalence, HFIAP）得分平均提升0.203，粮食不安全状况量表（Household Food Insecurity Access Scale, HFIAS）得分平均提升1.283，家庭膳食多样性评分（Household Dietary Diversity Score, HDDS）平均提升0.277。其中，将有机废弃物用作堆肥的CBE实践与粮食安全的关联整体为正相关，但未达到统计显著性；而废弃物分选实践的关联则显著且持续呈负相关。因此，旨在提升家庭粮食安全的CBE创新实践，可优先将有机废弃物资源化转化为畜禽饲料，同时需综合考量土地获取、市场准入、受教育水平、移动设备使用情况、收入水平以及干预实施所在的城区等社会经济因素。不过，为实现高效的废弃物资源化利用，预先完成废弃物分选环节必不可少。