This is a very compelling 24 min. video about the ground water impacts of shale gas development. It uses expert testimony, eye witnesses, and language-clarification to deconstruct the claim that fracking has occured for 60 years, over a million wells, with no documented case of ground water contamination. I think I can say now with certainty that that claim is false.
The ethics of non-disclosure agreements is an interesting, important aspect discussed as part of this. How can we collect evidence to correct corporate policy if no one is allowed to speak?