It’s Wednesday, July 15, and Burger King is trying to cut the climate impact of its burgers.

On Tuesday, Burger King announced that it was treating some of its cows to a new menu with a Thai twist, adding lemongrass to their feed. The fast-food giant is in the middle of a long-term scientific experiment — how much can it reduce the amount of methane cows burp into the atmosphere by adding lemongrass to their feed?

Burger King’s restaurants will be offering the fruits of its initial labor, new “reduced methane emissions beef,” to customers in Austin, Los Angeles, Miami, New York City, and Portland, for a limited time this month. The news exploded onto the internet on Tuesday with a splashy music video starring the Walmart yodeling kid and directed by Michel Gondry.

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Livestock are responsible for 14.5 percent of all human-caused greenhouse gas emissions in the world, and the methane emitted when cows burp constitutes 39 percent of that. Through a collaboration with two universities, Burger King said it found that when fed to cows during the last three to four months of their lives, the lemongrass diet reduced their methane emissions by an average of 33 percent per day during that time.

The research hasn’t been peer-reviewed yet, so that claim is still pending. And since Burger King has never disclosed its overall climate impact, there’s no way to gauge whether its low-methane burger could move the needle. But the company is at least admitting it’s a part of the problem, and helping to fund real solutions.

Emily Pontecorvo

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