Commercial/industrial quantities of hydrogen are made from fossil fuels, by the way.
Not for much longer. Laws requiring clean air and the economic benefits of using renewables are bringing change much quicker than you think.
There will realistically always be a need for coal and fossil fuels.
They said that about asbestos.
Piston powered aircraft won't run without leaded petrol
Wrong. Obviously you're not keeping up in that area either.
Ask Jabba. He'll explain it to you. I don't have the time or energy to correct every misconception out there.