1. Bracket RE (2006) Testimony before the Committee on Health, Education, Labor and Pensions, United States Senate
2. Bouwman P, Batjes NH, Bridges EM (1992) Methodology and data used to estimate natural N2O emissions. International Workshop on World Inventory of Soil Emission Potentials, August 24–27, Wageningen
3. Chantalakhana C (1996) Animal industries in Thailand and possible impacts of trade liberalization. Proceedings of the 8th AAAP Animal Science Congress, 13–19 October, Tokyo
4. Copeland BR, Taylor MS (1995) Trade and transboundary pollution. American Economic Review 85:716–737
5. Delgado CM, Courbois C, Rosegrant M (1998) Global food demand and the contribution of livestock as we enter the new millennium. Conference on Foods, Lands and Livelihoods: Setting Research Agendas for Animal Science, January 27–30, Nairobi, Kenya