Reuters: Biofuels made from plants and waste will prove an increasingly efficient and cheap substitute for oil in many areas over the coming five years, industry analysts said. As long as crude sells at prices towards US$100 per barrel, there will be strong demand for cheaper biofuels and manufacturing technology will improve, Vinod Khosla, founder of venture capital firm Khosla Ventures, told Reuters. "It’s very clear to me that within the next few years — about three I would …