Salon reports on a new study which suggests that "fracking" can pollute water sources:
"A new study, published in the formidable Proceedings of the National Academy of Sciences, upends that common-sense argument. It shows that fluids may have traveled from deep within Pennsylvania’s Marcellus Shale, one of the formations at the center of the gas boom, into shallow aquifers hundreds of feet above. These fluids aren’t products of fracking, but if they can travel up through layers of rocks, close to the surface, it means that fracking fluids could, too."
Read more about the study here