Workers with Ceria wait for a pipe-welding machine to finish connecting two sections of plastic irrigation pipe in Bario, Malaysia. The company has brought mechanized farming to the Kelabit Highlands. Jerry Redfern for NPR hide caption

itoggle caption Jerry Redfern for NPR

"Who Gets Kissed" corn is a variety bred in Wisconsin specifically for organic farmers. It's named for an old game. At corn husking time, a lucky person who found a rare ear of corn with red kernels had the right to kiss anyone that he or she chose. Courtesy of Adrienne Shelton hide caption

itoggle caption Courtesy of Adrienne Shelton

Using chemicals to control bugs or mold is common among commercial cannabis growers. But with no federal oversight, experts are concerned growers may be using dangerous pesticides. Ted S. Warren/AP hide caption

itoggle caption Ted S. Warren/AP

Cattle stand in floodwaters at 44 Farms in Cameron, Texas. The water demolished fences and ruined crops planted as feed. Katlin Mazzocco/44 Farms hide caption

itoggle caption Katlin Mazzocco/44 Farms

A row of newly planted organic tomatoes on April 23, 2015 in Firebaugh, Calif. Some farmers are moving tomato production to the north of the state where water supplies are better. Justin Sullivan/Getty Images hide caption

itoggle caption Justin Sullivan/Getty Images

In a village outside of Jenin, in the West Bank, Palestinian farmers harvest wheat early and burn the husks to yield the smoky, nutty grain known as freekeh. Daniella Cheslow for NPR hide caption

itoggle caption Daniella Cheslow for NPR

Coca-Cola cans on a production line at a bottling plant near New Delhi in 2013. The company decided in April 2015 not to build an $81 million bottling plant in southern India because local farmers said it might exhaust groundwater supplies. Prakash Singh/AFP/Getty Images hide caption

itoggle caption Prakash Singh/AFP/Getty Images

Now that's a big root: Sweet potatoes aren't tubers, or thickened stems, like potatoes. Sweet potatoes are roots — swollen and packed with starch. U-ichiro Murakami/Flickr.com hide caption

itoggle caption U-ichiro Murakami/Flickr.com

Dead almonds on a drought-stricken tree near Fresno, Calif., on April 10, 2015. Michael Nelson/EPA/Corbis hide caption

itoggle caption Michael Nelson/EPA/Corbis

Workers pick asparagus in early April at Del Bosque Farms in Firebaugh, Calif. This year, some farmers in the state will get water, others won't, based on when their land was first irrigated. David Paul Morris/Bloomberg/Getty Images hide caption

itoggle caption David Paul Morris/Bloomberg/Getty Images
Leif Parsons for NPR

Fields of carrots are watered March 29, 2015, in Kern County, Calif. Subsidized water flowing in federal and state canals down from the wet north to the arid south helped turn the dry, flat plain of the San Joaquin Valley into one of the world's most important food-growing regions. Frederic J. Brown/AFP/Getty Images hide caption

itoggle caption Frederic J. Brown/AFP/Getty Images

Humans have influenced Earth's history for thousands of years, though some scientists count changes of the last two centuries as especially notable. (Left to right) Universal History Archive/UIG via Getty Images; Hulton Archive/Getty Images; Liszt Collection/Heritage Images/Getty Images; Joint Task Force One/AP hide caption

itoggle caption (Left to right) Universal History Archive/UIG via Getty Images; Hulton Archive/Getty Images; Liszt Collection/Heritage Images/Getty Images; Joint Task Force One/AP

These beans, grown on test plots at the International Center for Tropical Agriculture in Colombia, can thrive in temperatures that cripple most conventional beans. Courtesy of CIAT/Neil Palmer hide caption

itoggle caption Courtesy of CIAT/Neil Palmer

The European Union banned the use of antibiotics to boost animals' growth in 2006. At first, the ban had little effect on the amount of drugs given to pigs. Carsten Rehder/Corbis hide caption

itoggle caption Carsten Rehder/Corbis

A field of unharvested wheat is seen in Ashby-de-la-Zouch, England, in 2012. Wheat wasn't cultivated in Britain until some 6,000 years ago, but DNA evidence suggests early Britons were eating the grain at least 8,000 years ago. Darren Staples/Reuters/Landov hide caption

itoggle caption Darren Staples/Reuters/Landov

Tim Meyers on his four-acre vegetable farm in southwestern Alaska. Behind him: an endless sea of tundra, and a glimpse of the town of Bethel. Eugenie Frerichs for NPR hide caption

itoggle caption Eugenie Frerichs for NPR

Arctic Granny (right), a GMO variety created by Okanagan Specialty Fruits, got the gren light from federal regulators Friday. The apple doesn't turn brown like a conventional Granny Smith apple (left). Okanagan Specialty Fruits hide caption

itoggle caption Okanagan Specialty Fruits

In 2013, the U.S. imported about 2 million tons of Coronas and Modelos, making beer Mexico's largest agricultural export to the U.S., according to a USDA report. Scott Olson/Getty Images hide caption

itoggle caption Scott Olson/Getty Images

The drought forced many citrus farmers near Orange Cove, Calif., to mulch their trees because they couldn't afford to keep them alive. Recent rain and new groundwater regulations have eased the crisis, but only slightly. Kirk Siegler/NPR hide caption

itoggle caption Kirk Siegler/NPR