How — and — why the world’s biggest buyers deploy clean energy

What do the nation’s biggest brick-and-mortar retailer, an e-commerce giant and the U.S. military have in common?They are some of the world’s biggest buyers of energy, and they are all scaling their efforts to procure renewables. Here, the heads of sustainability at Walmart and Amazon and former Assistant Secretary of the U.S. Air Force (now head of RMI’s Business Renewables Center) tackle sustainability solutions at a global scale with a focus on economic prosperity.