Scientists have already developed ways to create the hydrogen. Sometimes, when I read some posts, it seems like I’ve walked into the Pessimism Only Zone. But I’m not going to look up everything for you.
Making a dent in providing energy without using oil will mean a combination of things, not just one.
Wind energy works. When the pols let the wind farms be built. Lithium-ion batteries exist and are improving. Good technoligy and getting better by the day (drawback is disposal)
Ethanol from wood and non-food plants is available and will become a greater source of fuel.

I wonder if recycled paper products would work?
Solar at 30 cents a watt is available now and is tooling up for mass production now. All outdoor home lighting should be required to be solar. We are looking into solar for our deep well pump and emergency backup. Then when it is available we would like to run the whole house on it.
The problem is, and will continue to be, the money.

Someone wants to make a lot of money so they will likely choose the mix that is the most profitable. However, even the rich may have to give way and let less profitable alternatives in since the need is there.

God bless,
Ed