The one study said it could be done safely; however, is it always done safely is what the rest of the article is about. Methane has been found in ground water near fracking sites. Cleaning this up should be at the expense of the company doing the fracking not the homeowner.<quoted text>
The piece that you cite is generally supportive of fracking, which is safe if performed properly.
Treatment of the frac water is a significant technical issue, but with available solutions.
Shell seems optimistic in their ability to deal with all the sulfur. However, the large amounts remains an environmental concern.