This April 25, 2019, file photo shows a Burger King in Redwood City, Calif. Burger King is announcing its work to help address a core industry challenge: the environmental impact of beef. To help tackle this environmental issue, the Burger King brand partnered with top scientists to develop and test a new diet for cows, which according to initial study results, on average reduces up to 33% of cows' daily methane emissions. (AP Photo/Jeff Chiu, File) **FILE**
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