Ammonia could be an interesting fuel for vehicles (easy to synthesise from electricity, quite energy dense). It's a bit toxic though (probably manageable) and t

Ammonia could be an interesting fuel for vehicles (easy to synthesise from electricity, quite energy dense). It's a bit toxic though (probably manageable) and the round trip efficiency of synthesized ammonia used in a fuel cell or internal combustion engine must be really low. It would only make sense if we had huge amounts of surplus energy.