I was about to post a similar sentiment. I allowed it since the thought experiment expressed that there is no current knowledge, and you don't get to fission wi

I was about to post a similar sentiment. I allowed it since the thought experiment expressed that there is no current knowledge, and you don't get to fission without going through the industrial revolution (extreme temperatures, quality of metals, support services required by a stable/advanced society). However, the author goes into quite a bit of detail about the validity of photo-voltaic panels, having obviously done some research into how solar panels work, life-expectancy, manufacturing. It's for this reason why I'm wondering why fission wasn't researched. Nuclear is carbon-neutral, it's about 1000x the energy density of combustion, have lifetimes of several generations, and (at least in the States) have security measures that would make it resilient to "post-apocalyptic" scenarios. It seems ripe for this kind of thought-experiment.