It is important to note that the goal of this work is to build a foundation for future development of a comprehensive biowaste pretreatment network and its integration with reaction networks. The workflows addressing aims (a) to (d) will need to be replicated (with modifications where needed) across a larger range of regions, biowaste streams and pretreatment methods. Regardless, we hope that this study will stimulate a discussion in the wider community on the identification of key biowaste-derived molecular building blocks and the data requirements for enumeration of environmental impacts of circular chemical routes.