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.
Beehive designer Johannes Paul (right) and Natural England's ecologist Peter Massini, with a brood frame colonized with bees from the "beehaus" beehive on the roof of his house in London in 2009.
Wheat grows in a test field at Oregon State University in Corvallis. Some scientists believe that there's a chance that genetically modified wheat found in one farmer's field in May is still in the seed supply.
Natalie Behring/Bloomberg via Getty Images