1. EPA Designing a U.S. greenhouse gas emissions registry Climate and Energy Policy Series 2000 epa.gov/ghgreporting/basic-information/index.html World Resources Institute
2. Climate Change 1995. The Science of Climate Change. The Contribution of Working Group I to the Second Assessment Report of the Intergovernmental Panel on Climate Change;Intergovernmental Panel on Climate Change (IPCC),1996
3. Agricultural opportunities to mitigate greenhouse gas emissions;Johnson;Environ. Pol.,2007
4. European Commission-Joint Research Center European platform on life-cycle assessment 2009 http://lca.jrc.ec.europa.eu (Accessed February 22, 2012)
5. Environmental performance in the US broiler poultry sector: Life cycle energy use and greenhouse gas, ozone depleting, acidifying and eutrophying emissions;Pelletier;Agric. Syst.,2008