Then you are falling for battery propaganda. There have been many deaths related to battery fires. This has been well documented. Meanwhile, hydrogen deaths are nearly zero. The fuel does not concentrate enough to be all that dangerous. There have been zero "movies style car crashes".

Your study is basically the fossil fuel propaganda I'm talking about. It openly admits that hydrogen is not a direct GHG. So it conjures up a hypothetical situation where it extends the life of methane in the atmosphere. Even if it is real, it goes away once methane emissions stop. It can only be a problem if we fail to stop fossil fuel use.