Will this solution make burgers less bad for the planet?

Sushi rests in his pen at Davis in northern California.

Sat, 22 Mar 2025

By Shannon Osaka and Emily Wright, with photography by Helynn Ospina for the Washington PostSushi, a four-week-old Holstein calf, was lying in a pen under the hum of a metal fan when a group of professors and graduate students arrived to sample his stomach.The male calf greeted the researchers with a friendly nibble of their clothing, then flopped back down lazily on a bed of rice hulls.But even as the cow slumbered, deep in his four-chambered stomach, minuscule organisms were hard at work. Fungi, bacteria, and other tiny creatures we...

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