We review 75 studies on the competition for biomass and production resources such as land, water, labour and capital across food, feed and fuel production. We identified seven factors that are key to the availability and effective use of biomass and production resources. These ranged from ones related to production, such as crop yields to ones related to policy. Many of these factors resulted in trade-offs across different uses of biomass. Studies had different perspectives (e.g. economic, biophysical) on setting priorities for biomass and suggested different solutions to address competition (e.g. marginal lands). To connect these perspectives we suggest a framework that prioritises biomass and production resources for the use of human food before its use as feed or bioenergy.

我们回顾了75项有关生物质和生产资源（如土地，水，劳动力和资本）在食品，饲料和燃料生产中竞争的研究。我们确定了七个对生物质和生产资源的可用性和有效利用至关重要的因素。这些范围从与生产相关的（例如作物产量）到与政策相关的那些不等。这些因素中的许多因素导致了不同生物质用途之间的权衡。在确定生物质优先次序方面，研究有不同的观点（例如经济，生物物理），并提出了解决竞争的不同解决方案（例如边际土地）。为了联系这些观点，我们提出了一个框架，该框架应优先考虑将生物质和生产资源用于人类食品，然后再将其用作饲料或生物能源。