On a simpler scale, some communities do this. I've read a few articles about efforts in Virginia, as reported here by the BBC https://www.bbc.com/future/article

On a simpler scale, some communities do this. I've read a few articles about efforts in Virginia, as reported here by the BBC https://www.bbc.com/future/article/20250227-the-vermont-farmers-using-urine-to-grow-their-crops https://www.bbc.com/future/article/20250227-the-vermont-farm...