After the legacy of acid mine drainage from abandoned coal mines in Appalachian Ohio, there are several initiatives working to clean up the rivers and streams. Change-agents from universities, local organizations, and the government joined together in the 1990s to use both active and passive methods of neutralizing the pH level of the streams. Since then, they've brought the pH acidity down from 4.5 to 7 and grown the number of fish species from 4 to 37, and efforts are still ongoing and optimistic.

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