Once upon a time, ethanol was seen as the future of clean energy and as leading the U.S. to energy independence. That was 2004, but Wall Street wised up fast that ethanol was ready for a bust. So, in 2006 and 2007, when Wall Street firms started investing their own money in renewable energy companies, they left ethanol far behind. snip It is one of the few things Wall Street investment banks have gotten right lately, while private investors including Bill Gates and Richard Branson were bullish on ethanol as recently as January. We were thinking of this in reading...