1. Trenberth KE, Jones PD, Ambenje P, et al. Observations: Surface and atmospheric climate change: The physical science basis. In: Solomon S, Qin D, Manning M, et al., editors. Contribution of WG 1 to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change. Cambridge, UK: Cambridge University Press; 2007. pp. 235-336
2. Houghton RA, Lawrence KT, Hackler JL, Brown S. The spatial distribution of forest biomass in the Brazilian Amazon: A comparison of estimates. Global Change Biology. 2001;7(7):731-746
3. Kimball BA. Carbon dioxide and agricultural yield: An assemblage and analysis of 430 prior observations. Agronomy Journal. 1983;75(5):779-788
4. FAO (Food and Agriculture Organization of the United Nations). Major Food and Agricultural Commodities and Producers. Available online: http://www.fao.org/ess/top/commodity.html?lang+en&item=156&year=2005 [accessed on 1 July 2015]
5. Sharpe P. Sugar Cane: Past and Present. Carbondale, IL, USA: Southern Illinois University; 1998