Twenty-five years later, partly as a result of his efforts, The Wilderness Society fostered the Wilderness Act, which legally defined the wilderness of the United States and protected some nine million acres (36,000 km 2) of federal land.
Twenty-five years later as a result of his efforts, The Wilderness Society fostered the Wilderness Act. This was partly. The Wilderness Act legally defined the wilderness of the United States. The Wilderness Act legally protected some nine million acres (36,000 km 2) of federal land.