I call the transformed world toward which we can move โsustainable,โ by which I mean a great deal more than a world that merely sustains itself unchanged. I mean a world that evolves, as life on earth has evolved for three billion years, toward ever greater diversity, elegance, beauty, self-awareness, interrelationship, and spiritual realization.
Donella MeadowsA system is a set of things people, cells, molecules, or whatever interconnected in such a way that they produce their own pattern of behavior over time... The system, to a large extent, causes its own behavior.
Donella Meadows