“What lived once can live again.” Any old food can be turned into new food within 6 months.
This also applies to human waste from all 8 billion of us.
Technically we only need to buy food for 6 months acros the whole planet. If we compost our human waste, we can continue to regrow all of that food **forever.**
Matter can not be created or destroyed, but an old pizza can be grown into new pizza ingredients if you have the time, and space.
source- I build edible landscapes from ‘garbage’ ([album example](https://imgur.com/gallery/zZHD1))
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