Before this shoots too far off from reality, here's my two penn'orth based on 30+ years in the automotive industry. There are two ways you can use hydrogen to power vehicles. The first is hydrogen fuel cells - essentially a battery that reacts hydrogen and oxygen to produce water and energy. I believe this is Jolemai's area of expertise. JCB are keen on hydrogen combustion; hydrogen engines are feasible, the technology is fairly niche, but there are hydrogen engine programmes going on throughout the industry. Both technologies need a hydrogen infrastructure - this can only happen using green hydrogen i.e. electrolysis of water, this isn't yet state of the art, and will rely on renewable energy. There will be a transition through blue hydrogen, made from natural gas, this technology is well developed. The hydrogen used in vehicles is compressed, and with the right regulations in place is no more dangerous than petrol - there have been fuel cell vehicles running round for ages. The biggest problem, specifically for passenger vehicles is the physical infrastructure for roadside re-fuelling. This is less of a problem for heavy duty commercial vehicles, which are mostly re-fuelled at the depots - this possibly explains a lot of the JCB interest. There is a view that fuel cells will be the prime solution for trucks and buses in the US.