Soil Depletion, less nutrition

Source links for information:
Symphony of the Soil http://vimeo.com/64662202
University of Texas paper:
http://www.utexas.edu/news/2004/12/01/nr_chemistry

https://www.cncahealth.com/…/declining-nutrition-of-fruits-…

http://www.nationofchange.org/nutritional-value-food-risk-f…

http://www.scientificamerican.com/article.cfm…