In article >, Andy <q> wrote:

>Steve Pope said...

>> Vertical farming of a sort has been going on for centuries
>> in steeply-sloped parts of Italy like the Amalfi coast
>> or southern Tyrolia. All you need is a near-vertical, south-facing
>> slope. And lots of labor.

>I don't see how it's going to be cheap or even feasible to provide
>controlled artificial sunlight to all the floors year round.

I'm not aware that vertical farming ever involves artificial
light. Instead, the man-made vertical structure intersects
sunlight that would otherwise fall upon non-farming land,
like a business or residential district, taking advantage
of the fact that most sunlight is coming in at an angle
rather than from straight above.

Only pot farmers can afford much artificial light...

Steve