You are right, that is a problem. I know they can make space planes using compressed air air planes and are then laser ignited. But that's for like providing a payload to the ISS.
With ships you could put your payload under a sheet of solar cells. All equipment and payload have solar cells on top of them. Once the circuit is complete the pumping energy from the solar panels will power the engines. The key is area. The more area you got the more electricity that will be generated. Something to be explored at least.
Those big ass tractors man I have no idea. Which makes me nervous. I know everyone will say "but we have this many years left," but seriously, how are we going to power our current transportation? Are we going to have to redesign the process of doing things?
I know space X has a kickin new train. There were ideas for maglev trains. Maglev trains have a huge potential with solar energy. Just power the magnets and off you go.
I've seen ideas of totally automating the transportation system, at least for citizens. Everything is powered by sun, and no one would own a car. The units are public.
But you have a very good point. How are we going to supply energy to our great huge forms of transportation? We don't have hydrocarbons forever. Apparently you can make flammable hydrocarbons, but I do hope we move past that to something less intrusive to the environment. Time will tell.
PS - Fuell cells?
"Don't care. I don't care about polar bears, and I don't care about people who think our policies should be dictated by the effects on polar bears. Polar bears are basically Ice Monsters. Like that thing in the second Star Wars movie. **** em. And anything with more than four legs." -Deuce
I think people are greatly underestimating the amount of influence Bernie wields among the youth.