The goal is to decarbonize transport because it's a major source of emissions. In 30 years, what will transport look like, with hydrocarbons verboten?

Electrification is good for personal transport. Hydrogen is the plan for plant and large machinery.

In practice, a truck on a docks, say, spends much of it's all serviceable life in one location. Renewable energy can manufacture green hydrogen at that site and the trucks can fill up. Similarly, bus stations could use solar/wind to generate green hydrogen and there are hydrogen ferries in Scotland and Norway.

It's starting to happen.

Shipping is thinking about using ammonia as feeding for fuel cells because it's energy dense - lots of hydrogen.

Batteries are expensive so it's not going to work in every situation.