According to a UC Davis study, it takes about 148 gallons of water to produce the beef in a one-third-pound hamburger. Agriculture is the most water-intensive business on the planet. Since 95 percent of U.S. fresh water is underground, a significant amount is used to produce food. The High Plains Aquifer (also known as the ?Ogallala?) has been depleted by a volume of water equal to the annual flow of 18 Colorado Rivers and may only last another 25 years. Since local sources of water are not sufficient to feed us, we will continue to import food from many places.