"Ecological footprint" concept introduced

Together with his former PhD student Mathis Wackernagel, Wilhelm E. Rees of the University of British Columbia developed the concept of an “ecological footprint,” or “appropriated carrying capacity,” thereby creating the first quantitative and qualitative measurement of sustainability.

Further Readings: 
  • Wackernagel, Mathis, and William Rees. Our Ecological Footprint: Reducing Human Impact on the Earth. Gabriola Island, BC: New Society Publishers, 1996.
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1992