It seems that fracking is something that not too many people know about yet, so here is some information. To sum up, it is a process that pumps water and hazardous chemicals into the ground at high pressure to fracture the rock and release oil and gas to be used for energy. This tends to directly pollute ground water, and also the air when the chemicals are then brought up and evaporated off.
Here is a link to a documentary about it, with simple information to get a better understanding:
http://www.gaslandthemovie.com/whats-fracking#frackingprocess
And this is a link with even more in depth information:
http://www.earthworksaction.org/FracingDetails.cfm
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