Leaders of Iowa’s renewable fuels industry, along with Iowa Gov. Kim Reynolds, last week vowed to take the fight to Washington to battle an Environmental Protection Agency (EPA) proposal to retroactively reduce biofuel blending requirements for 2020 and 2021, which would destroy billions of gallons of biofuel de­mand.

The biofuel advocates, meeting at the Iowa Renewable Fuels Summit in Des Moines, also pledged an all-out effort to convince the Biden administration and others that renewable fuels must play a key role in reducing...