Cultivating change? Photo: iStockphoto Like his father, grandfather, and great-grandfather before him, Brian Miles spends his days working the family farm. Unlike his forebears, however, he also sits on the board of Mid-Missouri Energy, a farmer-owned ethanol cooperative in Malta Bend, Mo. Grist talked to Miles about the present ethanol boom, the potential for an ethanol bust, and the many splendors of fresh corn on the cob. How did you get involved in the ethanol biz? Our state corn growers association had a meeting a few years ago, because they had isolated this area as a good spot for …