EPA Proposes Poplar, Willow Trees For Ethanol In U.S. Biofuel Rule Tweak

Oct 05, 2016

The U.S. Environmental Protection Agency on Monday proposed tweaks to its Renewable Fuel Standard that would allow biofuels to be processed at more than one location and would allow cellulosic ethanol to be made from poplar and willow trees.

EPA also proposed new quality standards and environmental performance guidelines for biofuel blends containing 16 to 83 percent ethanol, and the agency is taking comments on the proposal for the next 60 days before it is approved.

The Renewable Fuel Standard, or RFS, was enacted in 2007 and designed to cut greenhouse gas emissions and boost use of advanced fuels such as cellulosic ethanol. However, critics say regulatory delays have contributed to slow growth in next-generation fuels.

EPA proposed adding hybrid poplar trees and willow trees as materials approved for production of cellulosic biofuel. DuPont Co and Poet LLC already produce small amounts of cellulosic ethanol made from crop waste such as corn stalks.

The change that would allow biofuel makers to partially process a feedstock at one location and further process into an biofuel at another location would “increase the economics and efficiency for the production of biofuels, particularly advanced and cellulosic fuels that have the lower carbon footprints,” the EPA said in a summary of the proposal.

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Video: Sweetener Effects on Gut Health - Dr. Kwangwook Kim

In this episode of The Swine Nutrition Blackbelt Podcast, Dr. Kwangwook Kim, Assistant Professor at Michigan State University, discusses the use of non-nutritive sweeteners in nursery pig diets. He explains how sucralose and neotame influence feed intake, gut health, metabolism, and the frequency of diarrhea compared to antibiotics. The conversation highlights mechanisms beyond palatability, including hormone signaling and nutrient transport. Listen now on all major platforms!

“Receptors responsible for sweet taste are present not only in the mouth but also along the intestinal tract.”

Meet the guest: Dr. Kwangwook Kim / kwangwook-kim is an Assistant Professor at Michigan State University, specializing in swine nutrition and feed additives under disease challenge models. He earned his M.S. and Ph.D. in Animal Sciences from the University of California, Davis, where he focused on intestinal health and metabolic responses in pigs. His research evaluates alternatives to antibiotics, targeting gut health and performance in nursery pigs.