If you were to draw a curve of energy availability from say 1900 until now, you would see that it peaked, just around the time of moon flights, supersonic passenger flights and reusable space shuttles, in the 70s and 80s..
Since then it has dropped elliptically, like a stone thrown, it's headed for zero, at an accelerating rate.
What we should conclude is that a certain pulse of energy was needed to achieve what was achieved then.
It isn't available any longer from the planet.
But it is from the sun.
Hence why it's most frustrating we seem hell-bent on carrying on digging down into extraction with massive attrition of human life, to the last kWhr, the last potato, whilst we have all the technology to reverse the depletion of energy, reverse the destruction, building back up what we took out. We could very quickly do that by domestic and community based hydrogen electrolysis from solar, but it would need to be backed by forever issued money for fee, reflecting forever energy for free.
That would destroy the hierarchy, so it's likely something that will never willingly be done by anyone in power because it removes their privelege and ability to control.
The space programs we see now are a shell of what was needed before to get even to the moon.
There is an awful lot missing now that is not seen much or mentioned, that was critical to the success of moon landings.
Radiation hardening? Gone. No money for that in the budget.
But again there could be, if the economic product crated historically from solar was monetised.