Our energy? Kinetic? heath?
Helium 3 on the moon?
Everything else outhere in space?
Our resources are limited here on earth. Even if we use sustainable energy-sources. We need to build windmills. Hydrotermal plants, Solar cells etc…they all need material (and energy) to produce.
But if we leave this limited sphere. Wich will cost a lot of energy and resources there’s virtually no limit anymore.
I’d say lets focus on renawable energy-sources & then get the space-age going.
Grtz