The long arms of pivot irrigation rigs deliver water from the Ogallala Aquifer to circular fields of corn in northwestern Kansas. Dan Charles/NPR hide caption

itoggle caption Dan Charles/NPR

An irrigation pivot waters a corn field in Nebraska. Many farmers in Nebraska and Kansas rely on irrigation to water their corn fields. But the underground aquifer they draw from will run dry. Nati Harnik/AP hide caption

itoggle caption Nati Harnik/AP

A worker dumps a bucket of tomatoes into a trailer in Florida City, Fla. Much of the lost and wasted weight in fruits and vegetables is water, according to a report by the World Resources Institute. Joe Raedle/Getty Images hide caption

itoggle caption Joe Raedle/Getty Images