Centuries of mismanagement and destructive development have gravely harmed American waterways, with significant consequences for the ecosystems and communities built around them. But a range of passionate and committed people have stepped up to restore streams and rivers around the United States. A husband-and-wife scientist team in Pennsylvania lead projects to unclog the sediment left by early colonists’ dams. Members of the Tulalip Tribes in western Washington State bring beavers back t...