What happens when a renowned river guide teams up with the CEO of one of the largest and least Earth-friendly corporations in the world? When it's former Wal-Mart CEO H. Lee Scott and white-water expert turned sustainability consultant Jib Ellison, the result is nothing less than a green business revolution. Wal-Mart--long the target of local businesses, labor advocates, and environmentalists who deplore its outsourced, big-box methods--has embraced...