I drove 1800 miles in a Hydrogen Car

It's all cool an all. But can I ask a couple of questions?
- Where this hydrogen/electricity is coming from? Is it still fossil, or some magic zero emission vacuum negative mass reactors?
- What is energy efficiency all over on the lap? From initial energy generating to the vehicle movement.
- What is the actual emission impact ratio of producing this vehicle to it's lifetime usage? Is it really less than combustion engines? Including all the mechanical parts like brakes and tires?
- How it will be utilized after it's life time ended? Is it really safer than normal combustion engine vehicles? Doesn't it include some poisonous materials in the cell units? How much energy cost of it's utilization.
- Is the production of source materials safer than combustion engine vehicles?
- Is working conditions of humans producing source materials is actually humane?

All this questions goes to the battery powered vehicles as well.
And this one goes to Hydrogen ones.

- Is this hydrogen tanks are actually safe? Isn't it a bomb under the seat? What's the actual conditions of it to go off? What the damage will be if it does? Is there some safe mechanisms except durability? Because durability whatever it is, is always limited and situations where it will be exceeded can not be excluded. Like it can tolerate a fire under it, or high external pressure applied, or a hit from a .50 cal. But will it stay whole if all this happend at the same time? Will it take a tank round straight into it? What if there will be not a fire, but a plasma cutter jet?