Forward from: Stonerismo
"No civilization will ever use all available energy from its planet, star, or galaxy, because the growth required to reach that level of mastery is unsustainable."
https://www.universetoday.com/169993/advanced-civilizations-could-be-indistinguishable-from-nature/
https://www.universetoday.com/169993/advanced-civilizations-could-be-indistinguishable-from-nature/