How to get to 10 trillion people in this solar system?

i believe Ive read where it takes about 1000 square feet of plant for
each person. this provides both the o2 and vegetables. if you want
meat, then you need to provide the cows, hogs, or other animals with
sufficient surface to eat and to create their o2. fish and water
based meat producers would be able to use the recycled water in a
stage a little sooner than it would be able to drink. considering
that the ppl would require 10000 cubic feet minimum and more would be
better, while the animals could be in smaller areas, there would be a
large amount of space taken up but the plants. most station designs
have the farm levels on different levels, plus other, non food plants
in the living areas as decoration/soothing sights/recreation areas.
most of the designs have some large yards and parks. the reason for
this is so that (1) the amount of plants needed for food would not
suffice for o2 generation. and (2) the food making plants would be
cyclic. they would be planted each year, grow, be harvested and die
with in months. this would cause some fluctuations, even with
staggered plantings. trees and grasses would even out those
fluctuations.

--- In spacesettlers@yahoogroups.com, Darren wrote:
>
> I'm not sure that's what she meant. Still that brings up an
interesting
> point, in a habitat with a population of several million, would the
plant
> life in the habitat be enough by itself to do the job of keeping
the air
> fresh, the water clean or would it need help? Without doing the
research I
> am only guessing but my own personal feeling is you would need to
have a lot
> more than the ecosystem you could fit in the habitat. I saw a
documentary
> once about an English hotel that recycled its sewerage. They ran it
through
> the normal primary and secondary treatments, then they cycled the
water and
> sludge through a system of ponds with different kinds of plants,
fish and
> small crustaceans, at the end they had a pond filled with trout
that ended
> up on the plates of the restaurant, I think the company that built
it was
> called "Living Machines" but I'm not sure. Habitats will not be
closed
> systems, people and goods will come and go, energy will flow
through it,
> perhaps the H2O, O2 and CO2 levels will be adjusted by simply
pumping in and
> out new elements.
>
> How much plant life is needed to keep a person alive? To provide
oxygen and
> food, now scale that up to enough to keep a million people, now add
enough
> to not just keep them alive but enough to provide kind of life most
people
> want to live. I think they are going to need mechanical help,
luckily they
> have plenty of energy, they can use it to rip any compound into
individual
> elements. It is an interesting problem and I suspect that Helen and
like
> minded people will never find a green Eden in orbit but they might
just find
> something that on the surface looks like it but under the surface
is a high