The Natural Step

Polk County Learns The Natural Step

Natural Step Taking Off
Jeff Peterson

The Natural Step, or TNS for short, is the title of a book published in 2004 by New Society Press. The name also represents a working definition of the word "sustainability" as it applies to community development. Based on the work of Swedish oncologist Dr. Karl-Henrik Robert, TNS describes a science-based systems framework for evaluating building and development practices.
The following four "system conditions" comprise the framework by which TNS practitioners measure sustainability:
1) In order for a society to be sustainable, nature's functions and diversity are not systematically subject to increasing concentrations
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