The U.S. Environmental Protection Agency (EPA) has implemented new Renewable Fuel Standard (RFS) mandates for 2026–2027 that include a nearly 70 percent increase in the biomass-based diesel quota relative to 2025 levels. While the policy is framed as a shift toward renewable energy, environmental researchers and agricultural economists warn that the reliance on crop-based fuels, particularly soybean oil, creates significant ecological risks, including indirect land-use change and increased greenhouse gas emissions. Despite the Trump administration’s broader efforts to roll back climate-related regulations, this expansion of the RFS continues a long-standing federal commitment to supporting domestic corn and soy producers.
The Mechanics of the Renewable Fuel Standard
The Renewable Fuel Standard requires transportation fuel sold in the United States to contain a minimum volume of renewable fuel. According to the Environmental Protection Agency, the program is divided into categories, including corn ethanol and biomass-based diesel. The recent increase in the biomass-based diesel mandate specifically targets fuels derived from vegetable oils and animal fats, with soybean oil serving as a primary feedstock.
For many years, the primary justification for the RFS was the reduction of greenhouse gas emissions compared to petroleum-based fuels. However, this premise has faced increasing scrutiny. A study found that the RFS caused the conversion of approximately 4.45 million acres of land into cropland between 2008 and 2016. The study concluded that the carbon intensity of corn ethanol produced under these mandates is not lower than gasoline and, in some scenarios, is at least 24 percent higher when accounting for land-use changes.
The Global Impact of Domestic Biofuel Mandates
The environmental consequences of U.S. biofuel policies extend far beyond American borders. Because the global vegetable oil market is interconnected, rising demand for soybean oil for diesel production in the U.S. exerts upward pressure on the prices of other oils, such as palm, canola, and sunflower. This creates an economic signal for producers worldwide to expand agricultural operations into sensitive ecosystems.
Research led by agricultural economists at the University of California has linked global demand for vegetable-oil-based diesel to significant deforestation. A working paper from the researchers found that between 2002 and 2018, approximately 4.2 million acres of forestland in Indonesia and Malaysia were converted to oil-palm plantations specifically to meet global demand for vegetable oils. The authors noted that this conversion accounted for roughly 20 percent of all forest-to-palm-oil expansion in that region during the study period. When factoring in the emissions from this land-use change, the researchers estimated that vegetable-oil-based diesel can have greenhouse gas emissions 22 to 52 percent higher than those of conventional petroleum diesel.
Political Resilience and the Agrarian Lobby
The persistence of the RFS, even under an administration otherwise skeptical of green energy initiatives, is often attributed to the political influence of the U.S. agricultural sector. Farmers rely on the RFS to guarantee a stable market for their corn and soy crops. This support is particularly relevant following the trade tensions and global supply chain disruptions that have affected the agricultural industry in recent years.
Journalist Michael Grunwald, in his book We Are Eating the Earth, describes this phenomenon as a “force field of agro-political influence” that shields biofuel mandates from the typical scrutiny applied to other energy policies. By framing the production of fuel-grade crops as a virtuous, domestic agricultural activity, the industry has successfully maintained the RFS despite evidence suggesting the program does not achieve its stated climate goals.
Future Outlook for Renewable Fuels
As the 2026–2027 mandates begin to take effect, the debate over the long-term viability of crop-based biofuels continues. While the transportation sector is undergoing a transition toward electric vehicles, which may eventually reduce the reliance on liquid fuels for passenger transit, aviation is a different story.
Readers are encouraged to share their perspectives on the balance between domestic agricultural support and environmental conservation in the comments section below.
Related reading