Asahi Shimbun: As interest in “green” vehicles rises on land, shipbuilders too are developing vessels that could emit fewer or no greenhouse gases. Currently on the drawing board are two concept vessels–a plug-in ship that runs entirely on lithium-ion batteries and a diesel-electric hybrid vessel. IHI Marine United Inc., a subsidiary of heavy machinery maker IHI Corp., is developing a plug-in ship powered by lithium-ion batteries. Its Zero Emission Electric Propulsion Ship will use batteries …