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The unintended consequences of clean fuel policies

Increased demand for renewable fuels is diverting edible vegetable oils, which are used as a feedstock for renewable fuels, from the food system. Credit: Getty images

How policies affect emissions, land use, and the prices of fuel and vegetable oils

Over the last two decades, both the federal government and state governments have enacted policies to reduce greenhouse gas (GHG) emissions in the transportation sector. In a new Special Issue of ARE Update, University of California agricultural economists explore how these federal and state renewable fuel policies have affected biofuel production for motor and aviation fuels and consider how these policies have affected land use and food prices. Their research shows that as U.S. demand for renewable diesel began to outpace supply, consumer prices for vegetable oil—which is used as a feedstock for renewable diesel—surged.

The national Renewable Fuel Standard (RFS) and California's Low Carbon Fuel Standard (LCFS), implemented in 2006 and 2011, respectively, have led to an increase in the amount of biofuels consumed and produced in the United States. While the RFS mandates that a minimum volume of renewable fuels be blended into U.S. transportation fuels, the LCFS sets an annually increasing targeted reduction in transportation-related carbon emissions. The LCFS set a 2030 target date to reduce GHG emissions by 20% through the development of a carbon trading program that requires refiners who produce ‘dirtier' fuels to buy credits from those who produce cleaner (e.g., renewable) fuels.

Currently, the retail diesel blend in California is 35% conventional diesel and 65% renewable diesel. Photo by Engin Akyurt of Unsplash

The authors show that after 2020, whenLCFS credit prices (i.e.,biofuel subsidies) were high, California saw an increasing volume of motor fuel coming from renewable diesel — which previously only made up around 5% of the state's diesel blend. Currently, the retail diesel blend in California is 35% conventional diesel and 65% renewable diesel.

By 2023, renewable diesel was the most consumed renewable fuel in California and also generated the most credits under the LCFS. Because renewable diesel is a perfect substitute for “conventional diesel,” it does not need to be blended with conventional diesel, unlike biodiesel which is chemically different from renewable diesel.

The agricultural inputs used to make renewable diesel can be used not only in the production of motor oil, but also in the development of sustainable aviation fuel (SAF). Additional tax credits set forth in the 2021 Inflation Reduction Act aim to bring about a 100-fold increase in the production of these fuels by by the end of decade. However, the authors of the second article show that current incentives to produce SAFs are not large enough to overcome the opportunity cost of instead using these fuels for on-road use.

Current incentives to produce sustainable aviation fuel are not large enough to attract soybean and corn away from use in on-road biofuel. Photo by Nick Morales on Unsplash

After the drastic increase in demand for renewable diesel (up 500% over the last five years), a higher percentage now comes from edible vegetable oils. This increased demand almost certainly plays a role in increasing inflationary pressure on foods such as cooking oils.

“From 2018 to 2024, food-at-home inflation was 24%, but over the same period, fats and oils inflation was 83%,” said UC Davis professor and co-author Jens Hilscher.

The increased demand for these oils from the United States has also led to booms in production in countries such as Brazil and Indonesia, and some of the land conversion into these vegetable oil crops could result in deforestation. Greenhouse gas emissions are a global challenge. The authors show that local biofuel mandates often succeed in moving U.S. consumption of these fuels from one product or region to another without necessarily decreasing emissions at the national level. Their research emphasizes the importance of a coordinated effort to target emission reductions with a careful eye to the indirect consequences that inevitably result from ambitious policies.

To learn more about how federal and statewide renewable fuel policies have affected the demand for biofuels, read the full Special Issue of ARE Update 27(5), UC Giannini Foundation of Agricultural Economics, online at

ARE Update is a bimonthly magazine published by the Giannini Foundation of Agricultural Economics to educate policymakers and agribusiness professionals about new research or analysis of important topics in agricultural and resource economics. Articles are written by Giannini Foundation members, including University of California faculty and Cooperative Extension specialists in agricultural and resource economics, and university graduate students. Learn more about the Giannini Foundation and its publications at

Posted on Tuesday, July 9, 2024 at 5:22 PM
  • Author: Ria DeBiase, UC Giannini Foundation
Tags: biofuel (13), energy (9)
Focus Area Tags: Agriculture, Economic Development, Environment


The unintended consequence's of government policy is rarely ever well thought out before policy is implemented. one size fits all policy doesn't always. Green agendas aren't always green, but political. It's difficult for politician's to not be political. Truth rather than emotion and politics would be a much better way to implement policy. Political truth changes with flavor of the month cause for political control/power. It's why so many people are skeptical of many of the "Green truther's".

Posted by Charles Freeman on July 10, 2024 at 4:31 AM

Can you explain/substantiate this statement (IN CAPS) in your article: "By 2023, renewable diesel — WHICH, UNLIKE BIODIESEL, IS A PERFECT SUBSTITUTE FOR CONVENTIONAL DIESEL - was the most consumed renewable fuel in California and also generated the most credits under the LCFS.

Posted by Torri Estrada on July 10, 2024 at 8:55 AM

Hi Torri,  
Thanks for the question. I think this quote from the article should answer your question: “RD is a perfect substitute for “conventional diesel,” which means that it does not need to be blended with conventional diesel, unlike biodiesel (BD) which is chemically different from RD.”

Posted by Ria DeBiase on July 10, 2024 at 10:03 AM

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