there good for th enviroment
I cnat belive you dont know this wow
there is no such thing as cold fusion. although when it gets invented you can be sure that subs will be one of the first to get it. all American subs are powered by nuclear fission. the nuclear reactions heat water which is pumped into a device called a steam generator. the steam generator makes... steam! the steam powers the turbines that make electricity and propel the boat.
Ship + Steam Engine= Steam Ship
You build a rocket and strap it on
good question
the answer is boat
make a rocket or a force field
Robert Fulton powered his steam boat with one of James watts steam engines. inventions such as the steam engine were generally the work of gifted tinkerers. they experimented with simple machines to make them better. the pace of change quickened as companies hired professional chemist and engineers to create new products and machinery.
to make travaling easeoir and shipping goods easeir
you can write about Newton's third laaw of motion
Other to coal I suppose you mean. Burning of any fuel like oil, wood, etc. Nuclear reactors. I suspect solar energy would make steam. It would be possible to use natural steam from deep in the ground.
Following recent advances I would make a hot liquid or steam powered motor that runs a generator. The sunlight focused by a parabolic mirror(s) onto a point where your fluid circulates past. That steam can be used to heat the house even after it runs a motor.
To entertain people and make money, same as most movies.