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In 1987, the United Nations publication, “Our Common Future,” also known as the Brundtland Report, first popularized the concept and definition of sustainable development. “Sustainable development is development that meets the needs of the present without compromising the ability of future generations to meet their own needs.” Today,...

A sustainability gap is the difference between the resources a person or population consumes and the resources available to support them. If demand exceeds supply, the sustainability gap measures by how much. If supply exceeds demand then no gap exists. The concept can be applied to...

The Bio-Geophysical Conditions for Ecocity Standards (www.ecocitystandards.org) include "Responsible Resources/Materials." This includes careful stewardship of scarce resources whether they be renewable or non-renewable. It may seem counter-intuitive to put sand in this category. Sand, one of the world's ubiquitous materials, is actually becoming a scarce...