For this Fact Checker, we are evaluating two related claims.Joni Ernst claimed, “Iowa remains a national leader in renewable energy, with 42 ethanol refineries and 12 biodiesel refineries in the state. According to the Iowa Corn Growers Association, the ethanol industry adds an estimated $5 billion to Iowa’s GDP and supports 55,000 jobs.”Bruce Braley claimed, “I grew up in rural Iowa, worked in ag jobs growing up, and will always work to put the 75,000 Iowans whose jobs depend on renewable energy first.”Source of claim: Ernst, Republican nominee for U.S.