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Supertopics:
Soil Degradation through 2015
Resource Depletion as Cause of Collapse 2011 through 2014

civilizations have fallen due to degradation of the soil      web

webhttps://www.sciencedaily.com/releases/2013/11/131104035245.htm
authorWits University
publicationScienceDaily
date2013-11-04

Documents:
agribusiness diminishes the diversity of soil biota
webMary C. Scholes and Robert J. ...Science2013-11-01

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