The Renewable Fuels Standard — that oh so ingenious method of creating a fake market for a not-green, not-clean, food-price-spiking, special-interest-serving and overall terrible product — requires that the nation’s refiners blend an ever-increasing volume of specified and so-called biofuels into the fuel supply. Refiners, however, are insisting that we’re now getting to a point at which mixing the required volumes will exceed the 10 percent ethanol threshold they find acceptable for use in cars and trucks, a.k.a. hitting the “blend wall.” Refiners that don’t manage to achieve the mandated volume of biofuels are required to purchase credits (RINs), and heightened demand for the credits is steadily pushing up their prices as the “blend wall” gets closer: