"Sustainability is a development that meets the needs of the present without compromising the ability of future generations to meet their own needs"

Wold Commission on Environment and Development. Brundtland Commission 1987.

Sustainability is related to the quality of life in a community -- whether the economic, social and environmental systems that make up the community are providing a healthy, productive, meaningful life for all community residents, present and future.

You can go to here to learn more about what sustainability really means.

Source: "Sustainable Measures"