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  • Adam, David. "Move to cut methane emissions by changing cows' diet." The Guardian. July 10, 2007. http://environment.guardian.co.uk/climatechange/story/0,,2122455,00.html
  • Buller, Henry. "Eating Biodiversity." University of Exeter. http://www.sogaer.ex.ac.uk/geography/Eating%20Biodiversity/download%20docs/Stakeholder%20Day%20All.ppt
  • Harvey, Graham. "Pastures new." Guardian Unlimited. July 11, 2007. http://commentisfree.guardian.co.uk/graham_harvey/2007/07/pastures_new.html
  • Lean, Geoffrey. "Are cows killing the planet?" Daily Mail. July 11, 2007.
  • McCandless, Kevin. "UK Hunting Ways to Minimize 'Greenhouse Gas' Emissions - From Cows." CNSNews. July 11, 2007. http://www.cnsnews.com/news/viewstory.asp?Page=/ForeignBureaus/archive/200707/INT20070711b.html
  • Smith, Lewis. "How to stop cows burping is the new field work on climate change." The Times. July 10, 2007. http://www.timesonline.co.uk/tol/news/uk/science/article2051364.ece
  • Woodward, S.L, Waghorn, G.C. and Laboyrie, P.G. "Condensed tannins in birdsfoot trefoil (Lotus corniculatus) reduce methane emissions from dairy cows." New Zealand Society of Animal Production. http://nzsap.org.nz/proc/2004/ab04039.html
  • "What is CLA?" Eat Wild. http://www.eatwild.com/cla.html
  • "Ag 101, Dairy Production Glossary." U.S. Environmental Protection Agency. March 6, 2006. http://www.epa.gov/agriculture/ag101/dairyglossary.html
  • "Garlic 'may cut cow flatulence.'" BBC News. July 10, 2007. http://news.bbc.co.uk/2/hi/uk_news/wales/mid_/6288012.stm
  • "Nitrogen-fixing trees." http://mbreiding.us/ert/Arizona/desbiome/nitrofix.htm
  • "Plant Nutrients." Plant Nutrition. North Carolina Department of Agriculture & Consumer Services. http://www.agr.state.nc.us/cyber/kidswrld/plant/nutrient.htm
  • "Dictionary." Sustainable Table.http://www.sustainabletable.org/intro/dictionary/
  • "Tannins: positive effects." Animal Science at Cornell University. Sept. 16, 2001. http://www.ansci.cornell.edu/plants/toxicagents/tannin/pos_effects.html