Fracking taking place US shallower depths than first thought – study

Blue and Green: Ongoing research suggests fracking is taking place at much shallower depths than first thought. Authors say there is no evidence of water contamination, but more research needs to be done to assess the impact of activity at these levels. In a presentation at the American Chemical Society conference in San Francisco on Tuesday, two researchers described their ongoing study into the depths of fracking by energy companies in the US. The researchers from Stanford Universities School of Earth Sciences......

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