This month, McDonald's announced that it plans to start transitioning to sustainable beef by 2016, with the goal of eventually making all of its burgers from sustainable meat. But the fast food chain has yet to specify what, exactly, it means by "sustainable." The company is working with the Global Roundtable for Sustainable Beef, a stakeholder group that includes Walmart and the World Wildlife Fund, to come up with a definition, and expects to announce further details of its plans in the spring.
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