1. RFA. 2010 Ethanol industry outlook: climate of opportunity. 2010: Renewable fuels association. [accessed 24.11.12].
2. DOE. 20% Wind Energy by 2030: Increasing wind energy’s contribution to U.S. Electricity Supply. US Department of Energy; 2008.
3. DOE. Annual Energy Outlook – With projections upto 2035. 2012:US Department of Energy. (Last accessed: November 17th 2012).
4. APS. Integrating renewable energy on the grid. 2010:American Physics Society. [accessed 17.11.12].
5. NOAA. Trends in atmospheric carbon dioxide 2012: Earth systems natural laboratory, national oceanic and atmospheric administration. [accessed 23.10.12].