According to the Union of Concerned Scientists' Consumer's Guide to Effective Environmental Choices:
About 800 million acres, or 40% of the U.S. land area, is used for grazing livestock.
Another 60 million acres is used to grow grain for feeding livestock.
American livestock generate more than 2 billion tons of wet manure, over ten times the amount of municipal solid waste generation.
According to Jay Weinstein's The Ethical Gourmet:
About 90% of the grain currently grown in the U.S. is used to feed livestock.
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