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1 “Antigone,” a play by Sophocles, from Greek Dramas, 1904, edited by B. Perrin. D. Appleton and Company, New York.


2 Meadows, D. H. 2008. Thinking in Systems: A Primer. Chelsea Green Publishing Company, White River Junction, VT. P. 169-170.
 

3Armstrong, P. 2012. Long, hot summer sends food prices soaring. CNN 31 Aug http://edition.cnn.com/2012/08/31/business/world-food-prices/index.html.
 

4 Adams, E. E. 2012. World forest area still on the decline. Earth Policy Institute 14Sept http://earthpolicyinstitute.libsyn.com/world-forest-area-still-on-the-decline.
 

5 Brown, L. R. 2012. Food, the weak link. Chapter 1 in Full Planet, Empty Plates: The New Geopolitics of Food Scarcity. Chapter 1 in Food: the Weak Link. Earth Policy Institute, Washington, DC.
 

6 Cairns, J., Jr. 2010. Threats to the biosphere: eight interactive global crises. Journal of Cosmology 8:1906-1915.
 

7 Cairns, J., Jr. 2012. The ninth threat to the biosphere: human thought processes. Supercourse Legacy Lecture: National Academy of Sciences Members’ Lectures. http://www.pitt.edu/~super1/lecture/lec46811/index.htm

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