American farms like this iceberg lettuce field owned by Duda Farm Fresh Foods outside Salinas, Calif., are facing a dwindling supply of farmworkers from rural Mexico. Kirk Siegler hide caption

itoggle caption Kirk Siegler

What is a "tea blend?" Sasha/Courtesy of Adagio Teas hide caption

itoggle caption Sasha/Courtesy of Adagio Teas

Berkshire pigs on Happy Hula Farm, a member of the Eden Farms collective. Amy Mayer/Iowa Public Radio hide caption

itoggle caption Amy Mayer/Iowa Public Radio

Jerry Seinfeld knows what this is. Now Steve Inskeep does as well. Kevork Djansezian/Getty Images hide caption

itoggle caption Kevork Djansezian/Getty Images

Eduardo Somarriba is a researcher at the Center for Tropical Agricultural Research and Education in Turrialba, Costa Rica. Dan Charles/NPR hide caption

itoggle caption Dan Charles/NPR