Wall Street Journal: Honda Motor Co. believes a fast-growing African grass may be the solution for fueling an as-yet-unbuilt power station at its car factory near Swindon, in the southwest of England. A big hurdle: getting local farmers on board. The plan to use miscanthus, a low-maintenance grass that can reach three meters tall and which is already burned alongside coal in some U.K. power stations, is driven by environmental concerns as well as uncertainty over U.K. power supplies. Honda is aiming to build an on-site…