Leona: According to its vice president of sustainability, energy is “the big kahuna,” for McDonald’s Corp., the world’s biggest restaurant chain. To cut the restaurant’s global annual energy bill (estimated at $2 billion), it is considering simple solutions, such as using more energy-efficient LED light bulbs, to complex, systemic changes, such as working with the WWF to rethink livestock-raising practices and its global food supply chain. It is suggested that consumers want to know where their food comes from and that sustainability should be considered in all business processes.