No matter how you slice it, eating beef will never be the greenest thing you do in a day. Scientists at Japan's National Institute of Livestock and Grassland Science estimate that producing 1 kilogram of beef emits more greenhouse gas than driving 155 miles. Since the average American covers 32 miles to and from work, your 8-oz. steak dinner might contribute to global warming as much as your daily commute.

Wouldn't it be nice if carnivores could minimize their environmental impact just by switching from one dead-cow product to another? Unfortunately, both grass-fed and corn-fed beef are terrible for the earth—but each in its own way.

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