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"If they're farming a bunch of hay, that's probably more easily adaptable to cellulosic biofuel feedstock, because they might already have the equipment … and you could harvest something like switchgrass then too," Lark says.

"We investigated how the timing of mixing the two yeast populations and the ratios in which the two populations were mixed affected the production of cellulosic ethanol."

"This opens a promising new window for using biomimicry to process these insoluble cellulosic materials in a greener way."

Inditex, meanwhile, has pledged to use 100% organic or sustainable cotton in its clothes before the year end, along with only man-made cellulosic preferent fibers — a plant-based fiber.

Michael McAdams, president of the Advanced Biofuels Association, called the EPA plan “a missed opportunity to invest in and expand the adoption of low-carbon advanced biofuels” such as algae, switchgrass, cellulosic ethanol or landfill waste.