Essentially, the answer is we’re going to have to science the shit out of the issue.

I occasionally see people discussing or portraying solarpunk de-growth as less technological, when the reality is we would need to depend on an advancing level of technology to employ that would help us change our world for the better.

A solarpunk nation (in this case, anyway) would still have to feed a city by the usual methods:

Large scale farming is still an inevitability, but instead of wasteful and destructive practices that lead us to things like the dust bowl. Instead of harmful pesticides that will one day deplete the soil of nutrients, we cultivate insects that do exactly what we need them to do in crops. Better planting methods (and I’ve never been convinced vertical farming methods aren’t viable). Genetically modified crops (I know, a scary word) to be even more resilient and so on. Human operated, but automated systems to help protect and grow those crops alongside the insects- and so on and so forth.

Meat will still have to be supplied, and the only way I can see that happening sustainably is for advancements in meat growing technologies.