Tubiello, F. N., Salvatore, M., Rossi, S., Ferrara, A., Fitton, N., & Smith, P. (2013). The FAOSTAT database of greenhouse gas emissions from agriculture. Environmental Research Letters, 8(1), 015009. Johnson, K. A., & Johnson, D. E. (1995). Methane emissions from cattle. Journal of animal science, 73(8), 2483-2492. Van Soest, P. J. (1994). Nutritional ecology of the ruminant. Cornell University Press. Dlugokencky, E. J., Nisbet, E. G., Fisher, R., & Lowry, D. (2011). Global atmospheric methane: budget, changes and dangers. Philosophical Transactions of the Royal Society of London A: Mathematical, Physical and Engineering Sciences, 369(1943), 2058-2072. Rohs, S., Schiller, C., Riese, M., Engel, A., Schmidt, U., Wetter, T., ... & Aoki, S. (2006). Long‐term changes of methane and hydrogen in the stratosphere in the period 1978–2003 and their impact on the abundance of stratospheric water vapor. Journal of Geophysical Research: Atmospheres, 111(D14). Methane Sinks - Soil. (n.d.). Retrieved March 19, 2017, from http://www.ghgonline.org/methanesinksoil.htm Overview of Greenhouse Gases. (2017, February 14). Retrieved March 19, 2017, from https://www.epa.gov/ghgemissions/overview-greenhouse-gases#methane Shindell, D. T., Faluvegi, G., Koch, D. M., Schmidt, G. A., Unger, N., & Bauer, S. E. (2009). Improved attribution of climate forcing to emissions. Science, 326(5953), 716-718. Are cows the cause of global warming? (n.d.). Retrieved March 20, 2017, from http://timeforchange.org/are-cows-cause-of-global-warming-meat-methane-CO2 Jones, M. (2014, February). Ways to Reduce Methane Production in Cattle. Retrieved March 20, 2017, from http://beef.unl.edu/reduce-methane-production-cattle Samuels, G. (2016, October 12). Scientists invent grass that reduces dangerous methane emissions from flatulent cows. Retrieved March 20, 2017, from http://www.independent.co.uk/news/science/denmark-scientists-develop-super-grass-to-cut-cow-burp-methane-emissions-a7358156.html Enteric Fermentation Mitigation. (n.d.). Retrieved March 20, 2017, from https://www.c2es.org/technology/factsheet/EntericFermentation