The key to an operational definition of ecological sustainability is the realization that we do not need to invent sustainable human communities from scratch but can model them after nature’s ecosystems, which are sustainable communities of plants, animals and micro-organisms. Since the outstanding characteristic of the Earth household is its inherent ability to sustain life, a sustainable human community is one designed in such a manner that its ways of life, businesses, economy, physical structures and technologies do not interfere with nature’s inherent ability to sustain life. Sustainable communities evolve their patterns of living over time in continual interaction with other living systems, both human and nonhuman. Sustainability does not mean that things do not change: it is a dynamic process of coevolution rather than a static state.

out of ‘Hidden Connections, a Science for Sustainable Living’ by Fritjof Capra, Harper Collins Publishers 2002