As Mark Bittman describes here, eating a vegan diet, even part-time, can have an important impact on issues like global warming, health care costs, and energy conservation. This makes our dietary choices even more meaningful and, thus, more sustainable. For example, many people are surprised to learn that animal agribusiness—eating meat—generates more greenhouse gases than all forms of transportation combined. More than half of U.S. grain and nearly 40 percent of world grain is being fed to livestock rather than being consumed directly by humans. More than 8 billion livestock are maintained in
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