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Mais links interessantes (em inglês)

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Fontes (em inglês)

• Adam, David. "Move to cut methane emissions by changing cows' diet." The Guardian. July 10, 2007.
• Buller, Henry. "Eating Biodiversity." University of Exeter. 
• Harvey, Graham. "Pastures new." Guardian Unlimited. July 11, 2007. 
• 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. 
• Smith, Lewis. "How to stop cows burping is the new field work on climate change." The Times. July 10, 2007.
• 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.
• "What is CLA?" Eat Wild.
• "Ag 101, Dairy Production Glossary." U.S. Environmental Protection Agency. March 6, 2006.
• "Garlic 'may cut cow flatulence.'" BBC News. July 10, 2007.
• "Nitrogen-fixing trees."
• "Plant Nutrients." Plant Nutrition. North Carolina Department of Agriculture & Consumer Services. 
• "Dictionary." Sustainable Table. 
• "Tannins: positive effects." Animal Science at Cornell University. Sept. 16, 2001.