After spreading across Pennsylvania, fracking for natural gas has run into government bans in the Delaware River watershed. The basins of the Delaware and nearby Susquehanna River offer a sharp contrast between what happens in places that allow fracking and those that do not.
Yale, 20 Oct 2015.
http://e360.yale.edu/feature/as_the_fracking_boom_spreads_one_watershed_draws_the_line/2921/