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- 2. Degraded Soil and Contaminated or Depleted Water http://www.treehugger.com/files/2009/03/land-degradation-endangers.php
- 18. Sources: Pretty, J. N., et al. "Resource-Conserving Agriculture Increases Yields in Developing Countries." Environmental Science & Technology 40.4 (2006): 1114-1119. Pretty, Jules. "AGROECOLOGY IN DEVELOPING COUNTRIES." Environment 45.9 (2003): 8-20. Serageldin, Ismail. "Sustainable Agriculture for a Food Secure Third World." Social Research 66.1 (1999): 105-115.