[qez]

I don't think solar energy is the only type of energy. And if you are at "we are running out of square meters of land to put solar panels on", space might actually be viable at that level of advancement.

Food is not limited by labor, or specifically scarce any more than any other good. In fact it's not obvious to me it will always require labor at all.

Strictly speaking, all goods are scarce if you don't have an infinite number of them. But I think we are lazily saying "scarce" when we mean something like "unavoidably zero sum". The only thing you list which has that is land.

[zdragnar]

It's the only type of renewable energy. All other renewable energies depend on the heat from the sun to work. The earth's core doesn't generate enough to fully satisfy our current needs, there's a finite quantity of uranium, plutonium, coal, oil, etc.

Of course, all of this is on a scale well beyond what we need to (currently) be concerned with- we don't have the technology to fully utilize what we have to fully eliminate scarcity in the first place.