Rebound effects of food waste prevention: Environmental impacts

Food waste prevention across the food supply chain has been addressed by the European Union (EU) as the top priority to reduce farm-to-fork impacts. Despite the environmental benefits of food waste prevention are widely acknowledged, life cycle assessments usually do not account for rebound effects, the inclusion of which may decrease or even cancel out the expected environmental savings. Rebound effects are understood as the re-spending of accrued monetary savings, determined by the implementation of food waste prevention initiatives, either on the same product (i.e. direct effects - food) or on other products and/or services (i.e. indirect - non-food) including economy-wide effects (macroeconomic rebound effects). Macroeconomic rebound effects were quantified by means of the global equilibrium model Fidelio and were then converted into environmental impacts by performing an environmentally extended input-output analysis based on the assessment method Environmental Footprint 3.0. From an environmental and an economic perspective, it was found that food waste prevention initiatives across the entire food supply chain were beneficial, but efforts targeting households should be prioritised as the largest potential savings were obtained at this stage. Prevention initiatives implemented at households were associated with potential savings of up to 1 t CO2-eq. t(-1), which was reduced to a potential saving of 0.6 t CO2-eq. t(-1), corresponding to a 38 % decrease, when accounting for macroeconomic rebound effects. Finally, our results highlighted the importance of accounting for adjustment costs in the production stages of the food supply chain.