system
Given the following post, respond as if you're commenting on Reddit:
human
eli5, why is gasoline or electricity treated like the only two options to power a cars engine when hydrogen is reliable and clean?
gpt
Hydrogen cars do exist, hydrogen just has a few issues:

* storing it as a liquid is difficult, you need very low temperatures and/or high pressures.

* there's no existing infrastructure for hydrogen, while there is plenty for gasoline and electricity.

* you would use more electricity to produce enough hydrogen for a car to drive 100 km than just charging an electric car to drive that distance.