(EnergyAsia, September 9, Wednesday) — Celullosic ethanol can be economically viable if the price of oil hovers above US$90, a study by US-based Sandia National Labs says. The study argues that cellulosic ethanol can become a 75-billion-gallon-a-year business, which could cut petroleum-associated emissions by 25%. For the fuel to become a viable business, the study…