The safety of both fracking and the disposal of its resultant waste underground are hotly contested.
He is both commercial and underground.
Surface and underground REC estimates were combined to estimate REC exposures in jobs that involved both surface and underground work.
Three years of drought, decades of overuse and now the oil industry's outsize demands on water for fracking are running down reservoirs and underground aquifers.
In addition to possible contamination of surface and underground water from fracking fluids, the sheer volume of water required poses challenges, especially in South Texas, which faces a severe drought and rapidly diminishing water levels in the local aquifer.
Campaigners also claim that there have been more than 1,000 cases of groundwater contamination in the US because of fracking and have urged a moratorium on underground drilling.
America now has an abundance of natural gas, thanks to the hydraulic fracturing, or "fracking", of underground rocks.
The news comes as controversial plans for fracking, where underground rocks are smashed to release gas that can be used as fuel, are explored across the UK, and protests bring a halt to drilling by Cuadrilla in Balcombe.
Queensland's environment department has alleged that Linc's fracking of underground coal seams to make synthetic fuel led to the contamination of soil and waterways by toxic chemicals.
Yet according to Cuadrilla, Elswick is a model for the kind of energy plants it will set up on several Lancashire sites once it has completed test drills involving the hydraulic fracturing – or fracking – of underground shale beds in the area.
The reason fracking works to force gas out of the rock is also why some observers think injection wells could be unstable the extreme pressure of injection can take nearly a year to dissipate, according to hydrologic consultant Tom Myers, who published a modeling study of fracking fluids' underground behavior in 2012.
