Bio-based materials are often celebrated for their potential to reduce environmental impacts—but how will they really perform when scaled from the lab or pilot phase to full industrial production? This workshop explores prospective Life Cycle Assessment (LCA) as a forward-looking tool to evaluate the environmental performance of emerging bio-based materials before large-scale deployment. Participants will learn how prospective LCA can bridge the gap between early-stage innovation and real-world implementation by integrating assumptions about future technologies, energy systems, supply chains, and production efficiencies. Through examples and interactive discussion, the workshop will demonstrate how scaling effects, technological learning, and system change can significantly alter impact profiles compared to conventional attributional LCA. The workshop is designed for researchers, product developers, sustainability professionals, and decision-makers seeking robust methods to assess whether bio-based materials can deliver meaningful environmental benefits at scale. Attendees will leave with a clearer understanding of prospective LCA concepts, practical challenges, and how these assessments can inform R&D priorities, investment decisions, and policy strategies.