References
Blake, M. (2013, 11/1). Bosses toast to 'harmless fracking': Halliburton executive drinks fluid as part of a PR stunt to prove it is safe. Mail Online News,
Bullis, K. (2013). One way to solve fracking's dirty problem. MIT Technology Review,
Ellsworth, W. L. (2013). Injection-induced earthquakes No. 341)
Ellsworth, W. L., Robertson, J., & Hook, C. (2013). Man-made earthquakes update. U.S. Geographical Survey,
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Environmental Engineering and Contracting (EEC) (2010). A Brief History of Hydraulic Fracturing. http://www.eecworld.com/services/258-a-brief-history-of-hydraulic- fracturing

Halliburton Co. (2013). CleanStim formulation. Retrieved 11/03, 2013, from http://www.halliburton.com/public/projects/pubsdata/Hydraulic_Fracturing... ures/CleanStim_Pop_up.html
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According to the U.S. Geographical Survey (USGS), “more than 300 earthquakes above a magnitude 3.0 occurred in the three years from 2010-2012, compared with an average rate of 21 events per year from 1967-2000” (Ellsworth, 2013). There is still debate about exactly how much of this seismicity is man made, but it is generally accepted that there are places where earthquakes are clearly associated with the deep injection of wastewater. These earthquakes are rarely noticeable, let alone powerful enough to cause annoyance or damage, but the idea of any sort of man made seismicity is enough to alarm the public.