Tiim messes around with that sort of farming in our back yard. He grows amazingly yummy hydroonic cucumbers, just don't look at the disgusting growing liquid and it will be fine. He grows veggies in a mix of shredded paper from work that is mixed with compost (gotta have something to fluff up the paper, or else it becomes paper mache). The paper shreds dissolve quickly, so he has to keep top-dressing the beds with more. Having seen all of this, it seems like it would be super easy to feed a city with a high rise building full of growing flats.
BTW, vegetable beds dressed with shredded copier paper look lovely - like they are growing in snow!
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