Walmart is certainly a retailer that evokes many emotions. At the same time, the numbers are undeniable. Worldwide, more than 100,000,000 shoppers per week choose to spend their dollars there. The company could have a major impact on sustainability. Some corporate sustainability efforts can be fairly easily thrown into the cynical greenwashing file. And Walmart has certainly suffered reputational slings and arrows for many reasons, but when the largest retailer in the world dedicates itself to a serious sustainability agenda we should probably sit up and notice.