“By leaves we live. Some people have strange ideas that they live by money. They think energy is generated by the circulation of coins. Whereas the world is mainly a vast leaf colony, growing on and forming a leafy soil, not a mere mineral mass: and we live not by the jingling of our coins, but by the fullness of our harvests.”
Sir Patrick Geddes (1854-1932), scientist, social visionary and town planner
Jo Woolf 
Brilliant! Now we could add oxygen factory. Marvelous things, leaves.
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Yes, indeed, Pat! Geddes was before his time with his vision of the earth and the way in which all life is inextricably linked.
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