Well, this music video has some answers. . .
From PBS.org’s Need to Know page, Brianna Lee writes:
. . . The students of New York University’s Studio 20, a journalism course that focuses on blending reporting with new media, collaborated with the investigative unit ProPublica to create a new kind of explainer to introduce the public to ProPublica’s three-year investigation on hydraulic fracturing – “fracking” – and the potential dangers it poses to communities’ drinking water supply.