There are other energy sources than oil to stave off entropy.

I've spent about 50 years looking at human survival and civilization as an ecological problem... how to make a healthy ecology to survive and develop in long term. Ecology is a powerful tool of analysis and is quite revealing. There is at least one path by genetic and strategic adaptation that will take us there. We even have the instinctive foundations needed to adapt to it. I won't bother telling you that you are wrong, but I will say I don't think you are likely to even have considered many important factors of the problem. Glance at this video about the genetic problems and solutions and it may show you that the problem of human survival may be different than you think.

Genetics For A New Human Ecology. https://www.youtube.com/watch?v=wjVieFKevMk . An updated book about it is available at https://www.amazon.com/dp/1544900996. I am working on re-writing the book on strategy. There is a path to survival.