Interesting though how if you suppose abundant, low cost renewable energy available at scale exists, the above problems suddenly become tractable and solved.
In fact many intractable problems in the world can be solved by more clean electricity - eg. 8000 odd skyscraper farms are enough to feed the world eliminating farm-land requirements but would require enormous amount of energy to run - also would represent single points if failure to attack in war - so will need society to evolve