Climate change and environmental accountability are both hot topics in the 21st century. More and more people are becoming concerned about the products they buy and what impact on the climate their production has. It has been reported that also more businesses are increasingly taking environmental performance into account when selecting suppliers. In July 2009, Wal-Mart announced its intention to create a global sustainability index system to keep track of products ratings according to the environmental and social impacts of their manufacturing and distribution. The motivation behind the index is to create environmental accountability in Wal-Mart’s supply chain and to encourage other retail companies to do the same. Wal-mart Stores, Inc., doing business as simply Walmart, is an American multinational retailing corporation that operates as a chain of hypermarkets, discount department stores, and grocery stores. As of January 31, 2017, Walmart has 11,695 stores and clubs in 28 countries. Walmart is the world’s largest company by revenue – approximately $480 bln (2016), as well as the largest private employer in the world with 2.3 million employees. Walmart Canada has stores in every province and territory, except for Yukon and Nunavut. Walmart Canada has in total 410 stores (January, 31st, 2017).