... "The livestock sector emerges as one of the top two or three most significant contributors to the most serious environmental problems, at every scale from local to global." It turns out that raising animals for food is a primary cause of land degradation, air pollution, water shortage, water pollution, loss of biodiversity, and not least of all, global warming.
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Last year researchers at the University of Chicago took the Prius down a peg when they turned their attention to another gas guzzling consumer purchase. They noted that feeding animals for meat, dairy, and egg production requires growing some ten times as much crops as we'd need if we just ate pasta primavera, faux chicken nuggets, and other plant foods. On top of that, we have to transport the animals to slaughterhouses, slaughter them, refrigerate their carcasses, and distribute their flesh all across the country. Producing a calorie of meat protein means burning more than ten times as much fossil fuels--and spewing more than ten times as much heat-trapping carbon dioxide--as does a calorie of plant protein. The researchers found that, when it's all added up, the average American does more to reduce global warming emissions by going vegetarian than by switching to a Prius.
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Animal agriculture takes up an incredible 70% of all agricultural land, and 30% of the total land surface of the planet.