Humans spent many years building big mechanized facilities to keep sewage and other waste from getting into our waterways.
In Arcata, the city and community supporters worked long and hard to get nature involved in the treatment process.
The result is the Arcata Marsh and Wildlife Sanctuary, a jewel in the city's environmental crown. It is featured in a new book called The Marsh Builders by Sharon Levy.
She visits the studio to talk about the marsh creation. And we bring in Ashland public works director Paula Brown, whose department will convert a piece of property the city just bought into another natural water treatment area.