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If I ate vegetables instead, it would still take just as much farmland to feed me as it would if I ate cow. It's the expansion of farmland and the reduction of wild terrirory that is the true threat to nature.[/b]
actually, this is a common misconception. the biological process of the "energy pyramid" dictates that only about 10% of ingested food becomes part of an animals flesh and bone, the other 90% being lost mostly through heat.
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Animals fed on grain and those which rely on grazing need more water than grain crops [2]. According to the USDA, growing crops for farm animals requires nearly half of the U.S. water supply and 80% of its agricultural land. Animals raised for food in the U.S. consume 90% of the soy crop, 80% of the corn crop, and 70% of its grain. [3]. In tracking food animal production from the feed trough to the dinner table, the inefficiencies of meat, milk and egg production range from a 4:1 energy input to protein output ratio up to 54:1. [4] The result is that producing animal-based food is typically much less efficient than the harvesting of grains, vegetables, legumes, seeds and fruits, though this might not be largely true for animal husbandry in the developing world where factory farming is almost non existent making animal based food much more sustainable.[/b]
eating meat can be sustainable, just not at the present levels of consumption common in the first world.