Virtuous circles : values, systems, sustainability
There are two principles here, both reflecting the natural world. The first is that natural systems are based on cycles, for example water, nitrogen and carbon. Secondly, there is very little waste in natural systems. The waste from one species is food for another, or is converted into a useful form by natural processes and cycles.This book shows how these principles can be used to create systems and settlements that provide food, energy and water without consuming large quantities of fossil fuels and other finite resources.