Entirely natural systems will work without any interventions. My garden has never seen a herbicide, pesticide, or fungicide. It produces abundantly. We need to develop complex synergies of food producing plants that need no inputs. That’s entirely possible.
For example, I read about a nitrogen crisis and yet many trees, climbers and ground cover plants like clover fix nitrogen. Also, natural animal urine is high in nitrogen. Nature has every answer.
This inspiring video is from permaculture expert Geoff Lawton’s farm in Australia. He shows how it’s done. This is a vision of a sane future for humans and food production which protects the environment. Highly recommended.