1. United Nations. Sustainable Energy For All. http://sustainableenergyforall.org/objectives accessed 26 April 2012.
2. Steffen W, Persson A, Deutsch L, Zalasiewicz J, Williams M, Richardson K et al., 2011. The Anthropocene: From global change to planetary stewardship. AMBIO: A Journal of the Human Environment. 40(7) 739-761.
3. Crutzen, P.J. and Stoermer ., 2000. The ‘Anthropocene’ Global Change Newsletter 41: 17-18.
4. Crutzen PJ. Geology of Mankind: The Anthropocene. Nature. 2002; 415: 23.
5. Steffen W, Crutzen, P.J, McNeill, J.R, 2007. The Anthropocene: Are humans now overwhelming the great forces of nature? AMBIO: A Journal of the Human Environment. 36(8); 614-621.