Here is a technology that could keep a technological society going, at least for a portion of the global population.  How big a portion I don't know, because I don't know how many locations are suitable for geothermal development or how much total power they could output.  To try and distribute this power, you also have the issue of being able to transmit it from where it can be sourced to where it is needed, aka wiring it into the grid.  On the upside, it is constant 24/7 power with zero carbon emissions and little waste I can think of.

According to the article, geothermal power is acccessed in 23 countries, though to what extent I do not know.  I know Iceland generates a lot this way.  The article claims this new plant is breakthrough tech, so perhaps we will be hearing more about it.

Geothermal Power is Finally a Reality After Next-Generation Breakthrough of Carbon-Free Energy in Nevada

https://www.goodnewsnetwork.org/fervo-energy-breakthrough-in-next-gen-geothermal-power-in-nevada/

RE