I've been watching Isaac Arthur's interesting youtube channel recently. He points out that fusion is really nice, but is not actually necessary since we have th

I've been watching Isaac Arthur's interesting youtube channel recently. He points out that fusion is really nice, but is not actually necessary since we have the sun. If you think "dyson swarm" big, you can capture all of the energy you could ever need from the sun, and without the need for any particularly advanced technology. https://futurism.com/could-humanity-ever-really-build-a-dyson-sphere/ https://futurism.com/could-humanity-ever-really-build-a-dyso... So what can you do with abundant energy? One thing is to make "active" structures like launch loops. This would allow you to make buildings larger than would be possible with normal materials (but your building collapses if there is a power failure). https://en.wikipedia.org/wiki/Active_structure https://en.wikipedia.org/wiki/Active_structure