The Environmental Protection Agency (EPA) is facing renewed criticism this week with scientists charging that the government arm inaccurately labeled ethanol a “renewable fuel” last February. According to reports, at the same time that it revised its renewable fuel standards, the EPA also re-ran numbers relating to corn-based ethanol’s lifecycle emissions, and determined that ethanol was responsible for substantially less greenhouse-gas emissions than gasoline, thus allowing it to be redesignated as “renewable.” But, scientists argue, the underlying data remained the same, and demonstrated that ethanol was not a “green” energy source. Nonetheless, they charge, the EPA presented the data in...