Closing the Loop: An Introduction to the Circular Bioeconomy
Modern environmental challenges demand a shift from the traditional "take-make-dispose" model to a sustainable circular bioeconomy. This approach uses biological resources efficiently to eliminate waste and decouple growth from environmental harm. This webinar to previews the practical tools and concepts we explore in depth at the AAEA pre-conference workshop on Saturday, July 25th in Kansas City, MO.
David Zilberman, University of California, Berkeley – Supply Chain in the Circular Bioeconomy
David Zilberman introduced the concept of the bioeconomy, describing it as the sectors of the economy that rely on renewable natural resources and modern science to produce goods and services, including food, fuel, chemicals, carbon sequestration, and environmental services. He outlined several components of the bioeconomy—including green, blue, white, microbial, and brown (circular) bioeconomies—and explained how advances in biotechnology, precision agriculture, information technology, and renewable resources are expanding opportunities to produce a wide range of products while supporting sustainability. He also emphasized the potential for the bioeconomy to strengthen rural economies while addressing climate change and biodiversity challenges.
Zilberman explained that supply chains are central to building a successful circular bioeconomy by connecting feedstocks, processing, manufacturing, and consumers. He highlighted examples such as using animal waste to produce protein, wood residues to produce biofuels, and crop residues to produce chemicals, emphasizing the importance of coordinating new feedstocks with the equipment and infrastructure needed to utilize them. He concluded that economics plays an important role in evaluating trade-offs, designing supply chains, and developing policies that balance benefits and risks while supporting innovation and investment in the bioeconomy.
Madhu Khanna, University of Illinois Urbana-Champaign – Designing Policy for Transitioning to a Circular Bioeconomy
Madhu Khanna discussed the need to transition from today's linear economic system, where resources are extracted, products are used, and waste is discarded, toward a circular bioeconomy that reduces waste and improves resource efficiency. She explained that circularity can be achieved by recycling and reusing materials, regenerating natural systems, and converting biological feedstocks and residues into biofuels, bioproducts, and bioenergy. Khanna highlighted existing technologies that can increase circularity on the farm, including precision farming, climate-smart regenerative practices, redesigned cropping systems, and the use of food crops, crop residues, and energy crops as feedstocks for the bioeconomy.
Khanna noted that transitioning to a circular bioeconomy requires overcoming barriers such as high upfront investment costs, long payback periods, infrastructure needs, technological uncertainty, and market risks. She emphasized that policies can help address these challenges through tools such as subsidies, crop insurance, low-interest financing, mandates, tax credits, and conservation programs that work together to encourage adoption of sustainable practices. She concluded that effective policies and market incentives can reward ecosystem services, support environmentally sustainable production, and encourage the long-term development of a circular bioeconomy.
Erin Webb, Oak Ridge National Laboratory – Advancing Circular Bioeconomy Systems Through Collaboration
Erin Webb presented an engineering perspective on the circular bioeconomy, describing it as a "system of systems" that connects production, processing, post-production, and end-use across food, fiber, and fuel products. She explained that achieving circularity requires tracking the flow of resources such as energy, water, carbon dioxide, nitrogen, and phosphorus while designing systems that reduce waste, keep materials in use as long as possible, regenerate natural systems, and provide economic benefits. Webb highlighted a collaborative project in eastern Tennessee and northern Alabama that is developing recyclable biomaterials from locally grown switchgrass and miscanthus for the automotive industry, with an emphasis on designing products for reuse, recycling, and eventual recovery through composting or bioenergy.
Webb emphasized that advancing a circular bioeconomy requires collaboration across disciplines, organizations, industry, and academia. She described the mission of the Circular Bioeconomy Systems Institute (CBSI) within the American Society of Agricultural and Biological Engineers (ASABE), which focuses on advancing education, professional development, innovation, and standards for sustainable circular bioeconomy systems. She also outlined efforts to build a broader network of partners, including AAEA and other organizations, to promote collaborative research, workshops, and future events that bring together multiple disciplines to address the complex challenges of circularity.
This program is supported in part by the Agricultural and Applied Economics Association.