Footnotes

1. State of California Department of Conservation, Oil, Gas & Geothermal. (2005). Oil and gas production History in California. Web. 6 Dec. 2012.
ftp://ftp.consrv.ca.gov/pub/oil/history/History_of_Calif.pdf

2. Montgomery, Carl, and Michael Smith. "Hydraulic Fracturing: History of an Enduring Technology." Society of Petroleum Engineers. Society of Petroleum Engineers, 10 2010. Web. 6 Dec 2012. 
http://www.spe.org/jpt/print/archives/2010/12/10Hydraulic.pdf

3. "A Brief History of Hydraulic Fracturing." Environmental Engineering and Contracting, inc., Environmental Engineering and Contracting, inc., Web. 6 Dec 2012.
http://www.eecworld.com/services/258-a-brief-history-of-hydraulic-fracturing

4. Beckwith, Robin. "Hydraulic Fracturing: The Fuss, the Facts, the Future." Society of Petroleum Engineers. Society of Petroleum Engineers, 10 2012. Web. 6 Dec 2012. 
http://www.spe.org/jpt/print/archives/2010/12/10Hydraulic.pdf

5. United States. Environmental Protection Agency. Regulation of Hydraulic Fracturing Under the Safe Drinking Water Act. Web. 6 Dec. 2012. 
http://water.epa.gov/type/groundwater/uic/class2/hydraulicfracturing/wells_hydroreg.cfm

6. Barlow, Zeke. "Oil fracking in state and county raises questions." Ventura County Star 16 Jan 2012, Online. Web. 6 Dec. 2012.  
http://www.vcstar.com/news/2012/jan/16/oil-fracking-in-state-and-county-raises/

7. “Natural Gas and the Environment” Natural Gas Supply Association, 2011. Web. 11 Dec 2012. http://www.naturalgas.org/environment/naturalgas.asp#greenhouse/