Japan is an island maritime nation. They obviously have been paying attention to what is going on in Copenhagen. The first sea trial of an ammonia ship. https://www.man-es.com/company/press-releases/press-details/...

If ships do embrace ammonia technology, it may make sense to use it to power cars. If you are a big corp you have to hedge your bets. This seems a more realistic strategy for the world largest car company than to bet every thing on EVs.