Forget about those exotic hydrogen fuel-cell cars, and those hybrid engine systems, as well. An Ottawa-based biotech company, Iogen Corp., thinks it has found the answer to the world's greenhouse-gas problems: a fungus once known for its ability to rot U.S. army tents. That may seem bizarre, but Iogen is just one of a growing army touting ethanol in gas tanks as the answer for meeting emission reductions under the Kyoto Accord. Right now, most ethanol is made pretty much the way Hiram Walker made booze: producers start with a grain, usually corn, then ferment and distil it. Iogen, however,...