
This is an interesting "Systems Diagram of a City", found at:
http://en.wikipedia.org/wiki/File:Systems_diagram_of_a_city.png
And the image appears on the wikipedia page for Emergy, and is labelled "Energy system diagram of a city in its support region"
http://en.wikipedia.org/wiki/Emergy
This diagrams the major energy flows in and out of a city.
Category
Level