NPR News: To conserve U.S. lands, ecologists want wolves and beavers to 're-wild' the West

To conserve U.S. lands, ecologists want wolves and beavers to 're-wild' the West
David Gura speaks with William Ripple, professor of ecology at Oregon State University, about his proposal to "re-wild" the American West by reintroducing beavers and wolves to public lands.

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