Here is a some more info... http://www.epa.gov/agriculture/ag101/cropmajor.html http://www.epa.gov/agriculture/ag101/cropmajor.html Corn is the largest crop i

Here is a some more info... http://www.epa.gov/agriculture/ag101/cropmajor.html http://www.epa.gov/agriculture/ag101/cropmajor.html Corn is the largest crop in the US. 84 million acres of it were grown in 2011 (try fitting that in a hydro system in an old factory). According to the National Corn Growers Association, 80% of corn in the US is consumed by animals.. poultry, cattle, hogs, fish etc. Soybeans are the second largest crop with ~74 million acres grown in 2011. Although not as dramatic as corn, animals eat a significant share of soybeans as well. Over 30 million tons of soybean meal is used as livestock feed annually (very roughly 1/3 of soybean production according to my quick and dirty calculations). The third largest crop is hay at ~56 million acres. This is exclusively used for animal feed. These three crops together are many times the acreage of all other crops combined. Manifestly, the big savings in water, fuel, fertilizer etc would be to remove the dependence on animals in the diet.