- Aired: 02/04/2010
- Rating: TV-G
It's known simply as "the shack," the simple Wisconsin River retreat that inspired Aldo Leopold to write "A Sand County Almanac." This classic of environmental literature has inspired millions with its expression of a "land ethic," a philosophy of living in better harmony with nature. Now, down the road from the shack the legacy of Aldo Leopold has inspired the "greenest" building the U.S.