In recent years, policy makers have become increasingly reliant on the use of Life Cycle Assessments (LCA) to establish a proper basis for more transparent and evidence-based decision-making on policies and regulations.
However, succesful LCAs must take into account a number of considerations in terms of how they influence the final result and policy support. These include data availability and quality, modelling approaches, methodological choices and uncertainty analysis.
European Bioplastics (EUBP) has put together a paper outlining challenges in using LCA methodology to evaluate innovative technologies. For a sound LCA comparison of bio-based plastics with other plastic materials (e.g. fossil, recycled, CO2-based feedstock), EUBP has published several recommendations, which you can read here.