What's Closed-Loop Thinking?

Planetary health  &  living within our means needs. . .
Closed-loop thinking about our food system which looks something like this . . .
2019 Closed-loop food system.png
• If it's not homegrown, then is it a luxury?
• At what scale and complexity do we lose resilience in our food system?
• Where are closed-loops already working to provide healthy food supply?
• What gaps can be bridge for closed-loops in our food system?