Dave Foreman started as a lobbyist for the Wilderness Society in the 1970s. Then he became a radical and co-founded Earth First! becoming America's most admired and notorious environmentalist. These days he runs a non-profit think tank called The Rewilding Institute. Foreman tells Steve Paulson why he gave up his radical practices and why he now wants to re-introduce wolves, grizzlies and other large carnivores into America's wilderness.