That's a valuable commodity: A hay bale at a farm in Eatonton, Ga., earlier this year. Erik S. Lesser /EPA /Landov hide caption

itoggle caption Erik S. Lesser /EPA /Landov

Mah Bow Tan, a member of Singapore's Parliament, inspects Chinese cabbage growing at the commercial vertical farm. Troughs of the veggies stack up to 30 feet in the greenhouse. Courtesy of MNDsingapore. hide caption

itoggle caption Courtesy of MNDsingapore.

After a leg injury didn't heal well earlier this year, Lou has difficulty walking. He and his partner, Bill, will be slaughtered at the end of the month, and their meat will be used to feed students at Green Mountain College in Vermont. Nina Keck/Vermont Public Radio hide caption

itoggle caption Nina Keck/Vermont Public Radio

Brent Ware, a member of the robotics team at Kansas State, stands next to a planting robot that won a national competition. Jeremy Bernfeld/Harvest Public Media hide caption

itoggle caption Jeremy Bernfeld/Harvest Public Media

Argentina has long been famous for its grilled beef. But that beef isn't what it was. Galina Barskaya/ hide caption

itoggle caption Galina Barskaya/

Early morning view of an automated irrigation system in on a farm in Sudlersville, MD

Cliff Owen/AP hide caption

itoggle caption Cliff Owen/AP

How much is it worth?

Robert Smith/NPR hide caption

itoggle caption Robert Smith/NPR