". . . to be considered sustainable by any rigorous definition, buildings must become energy neutral and either be built or converted to a “zero energy” building standard”
If we accept that “sustainable” takes its meaning from “sustainable agriculture“, or “the ability … to produce food indefinitely, without causing irreversible damage to ecosystem health”, then the definition of sustainable building must take on a more precise meaning. A more rigorous meaning that is quite different than what typically passes for a “green” building. (See Difference between Green and Sustainable)
What exactly might that mean? To answer that question it’s helpful to have a basic understanding of “carrying capacity”. Generally speaking, “carrying capacity” is the supportable population (animals, plants, trees, people, etc.) in a closed system, given the resources (food, water, energy, etc.) available within that system.
...to continue go to:
http://sunhomedesign.wordpress.com/2007/09/11/more-musings-on-sustainabl...











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