Growing enough food for EVERYBODY

I wrote recently of growing enough food under a single Island Three
habitat valley to feed the whole ten million person population, and
feed them well. Now I want to talk about exporting food the Earth,
and about feeding everybody in the Solar System.

Now, if one valley with a farming deck under it can feed ten million,
then putting such a farming deck under each of the six valleys in a
cylinder pair allows you to feed sixty million. And that's without
stacking multiple decks on top of each other. AND! you still have
almost half of the area taken up by windows.

But if this is a dedicated agricultural Island (and would appear that
it is), then you don't need that whole "Wow, I can look up and see a
blue sky overhead, with the sun by day and stars by night." What you
need is enough light to grow crops. This can either be provided with
artificial light, or natural sunlight can be brought in with fiber
optics. This doubles you growing area, and lets you produce enough
food for one hundred twenty-five million people *and them some*.
What if we start stacking? At eight decks high, we are growing
enough food for a billion. And again, not just-avoid-starving, but
good, hearty, lots-of-variety food for a BILLION people.

Thus we find that seven AgIsland pairs, if configured this way, could
feed the entire present-day population of the Earth, with a goodly
amount left over. This seems astonishing, as if it can not possibly
be true, but it is. At least, as far as I can tell it is. And even
if you double the "five hundred acres to feed ten thousand people"
assumption (which is already more than triple what the 1975 study
concluded was needed), then OK, it takes FOURTEEN AgIsland pairs to
feed the whole world with plenty left over.

With most of the Eath's population living in cities (affluent
cities), and little or no need for food production on the planet,
much of the Earth could revert to wilderness and/or parkland.