Global school plate waste estimates highlight the need for building a sustainable food education system.

Food waste reduction is essential for supporting the sustainability of food systems. Wasteful behaviours are difficult to change after they have been formed, highlighting the importance of early interventions. Here we present an assessment of school plate food waste from 29 countries, and examine the environmental implications, causes, and interventions. School plate waste ranged from 4% to 46% per capita per meal and was positively correlated with country income levels. On a global scale, this waste embodies ∼150 Mha of cropland and ∼770 MtCOe of greenhouse gas emissions; hence, reducing school plate food waste offers potentially large environmental gains. We propose a comprehensive, multistakeholder framework centred around sustainable food education that cultivates food systems knowledge and skills, and an appreciation for nature and food labour to reduce the psychological distance between youth and their food waste. To effectively implement the framework requires the support and engagement of families, communities and the broader society beyond the confines of schools.