“When one tugs at a single thing in nature, he finds it attached to the rest of the world.” (John Muir, 1838-1914)

Definition of sustainability as meeting “the needs of the present without compromising the ability of future generations to meet their own needs” (Brundtland Commission, officially WECD 1983-1987)

Systems:

  1. Parts
  2. Connections
  3. Functions/Purpose
  4. A boundary

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