The food ends up in landfills, where it produces staggering amounts of methane gas as it rots. To a certain extent, stores do make an effort to cut down on food waste. After all, it affects their bottom line. But ultimately, markups on produce are high enough that waste isn't much of a concern. Sam's Club and its parent company, Walmart, are taking steps toward better waste management, though. Walmart Inc. has long partnered with food banks to donate edible food. The combined donations from both stores make them the biggest contributors in the United States to Feeding America, an organization with a network of food banks and meal programs. Walmart Inc. also donates money to the organization.