Agrifood supply chains contribute to many environmental and social problems. Sustainability standards—rules that supply chain actors may follow to demonstrate their commitment to social equity and/or environmental protection—aim to mitigate such problems. We provide a narrative review of the effects of many distinct sustainability standards on different supply chain actors spanning multiple crops. Furthermore, we discuss five emerging questions—causality, exclusion, compliance and monitoring, excess supply and emerging country markets—and identify directions for future research. We find that, while sustainability standards can help improve the sustainability of production processes in certain situations, they are insufficient to ensure food system sustainability at scale, nor do they advance equity objectives in agrifood supply chains.

农产品供应链会导致许多环境和社会问题。可持续性标准——供应链参与者可能遵循的规则，以证明他们对社会公平和/或环境保护的承诺——旨在缓解此类问题。我们对许多不同的可持续性标准对跨越多种作物的不同供应链参与者的影响进行了叙述性审查。此外，我们讨论了五个新出现的问题——因果关系、排除、合规和监控、供应过剩和新兴国家市场——并确定了未来研究的方向。我们发现，虽然可持续性标准在某些情况下有助于提高生产过程的可持续性，但它们不足以确保大规模的粮食系统可持续性，也不能促进农产品供应链中的公平目标。