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That is some kind of Oil centric thinking that got us in this mess in the first place. Renewables and fusion can do the much better better job at any point. By the way coal will not form ever again, only reason why coal/oil formed is because bacteria has not learned how to decompose cellulose at the time. https://www.nationalgeographic.com/science/article/the-fanta...

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I believe that theory is no longer valid. It was supposedly fungus that feeds on woody plants that resulted in a drop in lignin rich coal but that doesn't seem to quite work out. Coal is formed when there's a lot of organic matter that gets trapped in an oxygen poor environment and then buried and compressed over time. That process is certainly still happening though not at the same rate it has in the past. This article has some good details https://arstechnica.com/science/2016/01/why-was-most-of-the-...

There's still quite a lot of coal though.

I don't think renewables and fusion will be an option in a post apocalyptic society. After a few generations of anarchy the knowledge will be lost.

True, solar and nuclear need a bit more tech, but wind and hydro are quite simple they need a bit of wire, magnet and something to spin.

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