1. Beddington J. Food, energy, water and the climate: a perfect storm of global events? 2010 http://www.bis.gov.uk/assets/bispartners/goscience/docs/p/perfect-storm-paper.pdf
2. US Energy Information Administration International energy outlook 2010 http://www.eia.doe.gov/oiaf/ieo/world.html
3. 2009
4. s202 Energy Independence and Security Act of 2007. http://www.epa.gov/regulations/laws/eisa.html
5. Use of US croplands for biofuels increases greenhouse gases through emissions from land-use change;Searchinger;Science,2008