
Most of the concerns about fracking have focused on the fluids involved in the process, which tend to exit the wells heavily contaminated with dissolved metals and radioactive material. But those may not be the only worries. A study, released yesterday by PNAS, now shows that fracking may be contaminating local groundwater with methane to pose a risk of explosion.As most forms of energy in the US have been going up in cost, natural gas has gone in the opposite direction. This is largely the result of a used extraction process called "fracking," in which fluids under high pressure are used to fracture rock formations deep underground, releasing...