As clean fuels grow, pressure on feedstocks including vegetable oils, animal fats and used cooking oil had never been greater. With margins thin and compliance burdens rising, producers, marketers and advocates must understand the shifting landscape for feedstocks. This panel tackles pricing swings, traceability hurdles and the hunt for reliable, low-carbon inputs for biodiesel and renewable diesel. Experts in trading, compliance and production will break down how 45Z, RFS changes and import rules are reshaping sourcing strategies—and what it all means for future production.
Speakers:
Nathan Burk
Senior Vice President Fats, Oils, Greases
StoneX Commodity Solutions
Nathan Burk is a recognized leader in the renewable fuels and feedstock trading industry, currently serving as Senior Vice President of Fats, Oils, and Greases at StoneX Commodity Solutions. Since joining StoneX in 2003 as a Risk Management Consultant, Nate has played a pivotal role in expanding the company’s footprint across the renewable energy and agricultural sectors.
Today, the StoneX Commodity Solutions Fats, Oils and Greases team executes over 4 billion pounds of feedstocks annually, helping clients manage supply chains, secure feedstock, optimize margins and access financing solutions. His strategic vision fosters innovation in renewable fuels and vegetable oil crushing, notably in monetizing the 45Z Clean Fuel Production Tax Credit in 2025.
Early in his career, Nate worked closely with ethanol and biodiesel producers, providing strategic financial trading solutions and conducting over 30 feasibility studies to support plant development and margin optimization. In 2006, he spearheaded the creation of a physical trading desk focused on feedstock procurement for biodiesel production, a business that has since evolved to serve renewable diesel, sustainable aviation fuel, food and feed sectors, and long-term feedstock offtake agreements.
Kurt Kovarik
Vice President, Federal Affairs
Clean Fuels
Kurt serves as Vice President, Federal Affairs for Clean Fuels Alliance America, leading members in advocating federal policies that support the industry’s growth. Since joining Clean Fuels, Kurt has helped the industry secure a long-term extension of the biodiesel tax incentive, preserve important protections against unfair international trade and ensure the integrity of the Renewable Fuel Standard program. Kurt continues to organize the industry’s advocacy for equitable tax, infrastructure and environmental policies.
Prior to joining Clean Fuels, Kurt worked for more than 20 years in the office of Senator Chuck Grassley (R-IA), leading efforts on the Renewable Fuel Standard, the biodiesel tax incentive and increased use of clean fuels. An Iowa native, Kurt graduated from Luther College with a degree in political science.
Chad Edwards
Director, Global Seeds Business Development
Corteva
Chad Edwards is a proven leader in agricultural innovation and strategic investment, driving renewable energy opportunities across global markets. As part of Corteva’s Seeds Business leadership team, he provides functional and operational oversight, with a focus on identifying and advancing early-stage, disruptive technologies that align with Corteva’s long-term strategy and product pipeline.
With more than 14 years of experience at Corteva and its heritage organizations, Chad has been instrumental in building strategic biofuel partnerships and shaping investment strategies that deliver impactful innovation across the agricultural and energy sectors.
Moderator:
J. Alan Weber
Ag Economist and Founding Partner
MARC-IV Consulting
J. Alan Weber is a founding partner of MARC-IV (M4), a consulting company dedicated to fostering biobased innovations. He has played a pivotal role in guiding the commercialization of biodiesel since the industry’s inception in 1991. A nationally recognized economist, Alan brings extensive expertise in the soybean industry, soil health strategies, cover crop integration in row crop production and emerging carbon markets.
Among his current efforts, Alan leads economic analyses on the impacts of the Renewable Fuel Standard (RFS), quantifying the benefits of increased biodiesel and renewable diesel use while creating valuable markets for U.S. farmers. He serves as a director on the Board of CoverCress, Inc., an innovative startup developing a new winter oilseed crop and low-carbon feedstock for biofuels under the CoverCress™ brand. Alan also collaborates with the University of Missouri’s Center for Regenerative Agriculture, focusing on carbon market opportunities for farmers through the Missouri Climate Resilient Crop & Livestock Project.
His federal committee appointments include service on the EPA’s Farm, Ranch, and Rural Communities Federal Advisory Committee and the USDA and DOE’s Biomass Research & Development Initiative Technical Advisory Committee.
In addition to his consulting work, he is an active producer, farming nearly 900 acres with his family in central Missouri using climate-smart agricultural practices such as no-till and cover crops.
Alan holds an M.S. degree in Agricultural Economics from the University of Missouri.

