Renewable Fuel Standard

Nearly all of the ethanol blended into U.S. gasoline is made from corn.
File: Grant Gerlock / Harvest Public Media

On a sweltering summer morning, Rob Mitchell surveys a plot of switchgrass at a research field near Lincoln, Nebraska. The grass is lush, green and nearly six feet tall.

“And it will get a couple feet taller than this,” says Mitchell, an agronomist with the U.S. Department of Agriculture. “So we’re putting on a lot of biomass right now.”