Closing the loop
One of the most potent forces in the world today is urbanisation. Some of the seemingly disconnected problems associated with urbanisation - water scarcity, food insecurity and pollution - are really the manifestation of several underlying assumptions and actions. One assumption is that there are no limits to resources such as water and land. Another is that the environment can assimilate the wastes that we produce from using these resources. These assumptions lead to linear flows of resources and wastes that are not reconnected. The technological developments to serve these linear flows have become part of the problem, not the solution.
Esrey, S. A., Andersson, I.
UA Magazine 3 - Health Aspects of Urban Agriculture, RUAF Foundation, pp. 35-37
Esrey, S. A., Andersson, I. (2001). Ecological sanitation - Closing the loop. UA-Magazine.