No Kindle device required. Download one of the Free Kindle apps to start reading Kindle books on your smartphone, tablet, and computer.
To get the free app, enter your e-mail address or mobile phone number.
MARGARET M. WITTENBERG is global vice president of Whole Foods Market, where she has served since 1981. She is a former member of the USDA National Organic Standards Board and currently serves on the Marine Stewardship Council's Board of Trustees and the Animal Compassion Foundation. She lives in Fredericksburg, Texas.