Existing LCA methods (especially impact categories considered) do not always include some of the environmental interventions that are unique to bio-based materials. Subsequently, this report to investigates areas where LCA impact assessment methodology can be enhanced or expanded in order to fully account for the environmental advantages and disadvantages of bio-based packaging materials. The work focuses on impact assessment areas most pertinent to three of the highest-profile environmental policy objectives of the day, i.e. climate change, single-use plastics and microplastics generation. Subsequently, recommendations are made with regards to the application of the global warming potential impact category when conducting LCA studies comparing bio-based and other packaging materials, and proposals are presented for simplified impact categories for littering potential and microplastics generation potential.