Wal-Mart to Suppliers: Green Up

In a landmark initiative with far-reaching potential, Wal-Mart Stores announced yesterday that it wants to improve the energy efficiency from the vast network of suppliers that fill the shelves of the world's largest retailer. As competitors have seen before, what Wal-Mart demands (typically, lower prices) Wal-Mart gets. So this move has the potential to reduce energy use around the world.