The average American eats 80.6 pounds of beef every year. Since farming cattle is water and land-intensive—and responsible for between 18 and 51 percent of greenhouse gas emissions—companies like Beyond Meat are racing to diversify protein sources that will feed the world's population for as long as possible. In this feature episode of If Our Bodies Could Talk, senior editor James Hamblin travels across California to learn about the science and psychology of diversifying people's protein-intake portfolio.

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