Although salmon are lovely, so too are pristine forests, healthy mountain streams, clean rivers for drinking water and recreation.

ECONOMIST: Cities and the environment

The legislation would remove what had been seen as a barrier for drillers wanting to use coal mine water: the state's Clean Streams Law.

WSJ: Pa. pushes drillers to frack with coal mine water

Chung writes that she now favors companies with large recurring revenue streams, plus strong secular growth opportunities, clean balance sheets and shareholder-friendly capital allocation policies.

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"Rivers, streams and lakes are measurably cleaner than they were before the Clean Water Act, but we still have a long way to go, " said Bob Irvin of the World Wildlife Fund, the world's largest privately funded conservation organization.

CNN: Challenges ahead for a changing Earth

Another method, used mainly in Pennsylvania, is to simply use treatment facilities to clean up the fracking wastewater before it heads into local rivers and streams.

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