alternative. The greenest option? Look in your closet and drawers for a strong, durable, reusable bag, and take it with you to the supermarket, mall, or your favorite takeout place. From the production of petroleum-based fertilizers to the cross-country distribution of seasonal fruits and vegetables, the modern food system accounts for 10 percent of U.S. energy consumption. And yet at least 30 million acres of abundant front lawns remain idle. Try turning a small patch into your own personal produce section.