Shoppers have long sought ways to make more sustainable choices at the supermarket — and for good reason: Our food system is responsible for a third of global greenhouse gas emissions . The vast majority of emissions from agriculture come from raising cows on industrial farms in order to sell burgers, steak, and other beef products. Beef production results in two and a half times as many greenhouse gases as lamb, and almost nine times as many as chicken or fish; its carbon footprint relative to other sources of protein, like cheese, eggs, and tofu , is even higher.

If you want to have a lighter impact on the planet, you could try eating less beef. (Just try it!) Otherwise, a series of recent lawsuits intends make it easier for consumers to discern what’s sustainable and what’s g

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