“Imagine a world with free energy…”
probably not going to happen, for a lot of economic/
engineering reasons. transmission and distribution infrastructure costs, for one.
…INSTEAD, imagine a world with very cheap energy. that’s a little more realistic. the chinese are doing some interesting r&d on cold fusion, thorium reactors, and more. then, there’s the pebble bed reactor… nuclear energy is just emerging from its infancy.
as an analogy, consider coal and steam technology about the point when somebody realized steam could push a turbine instead of just a reciprocating piston engine. say, the end of the nineteenth century…