Syrian gardeners at the Domiz refugee camp in northern Iraq share the harvest. Kastro Yosef/The Lemon Tree Trust hide caption

Line workers sort freshly cut avocados at Frutas Finas packing plant in Tancitaro. Forty-five percent of the world's avocados come from Mexico. Eighty percent of avocados consumed in the U.S. come from Mexico, the majority from the small mountain town of Tancitaro. Carrie Kahn/NPR hide caption

Workers prepare pineapple seedlings for planting at the Gold Coast Fruits farm in Ghana. Amy Yee for NPR hide caption

Soybean plants, with pods ready for harvest, in Boonsboro, Maryland. Edwin Remsburg/VW Pics/UIG via Getty Images hide caption

Chip Councell's ancestors began farming on Maryland's Eastern Shore in 1690. He says that in today's world, U.S. farmers have to look abroad for markets. John Ydstie/NPR hide caption

A worker milking cows at a farm in Manati, Puerto Rico, on Thursday. Puerto Rico's dairy farmers account for about a third of the island's total agricultural production. Now they're struggling to recover their cows and get them milked. Courtesy of Manuel Perez hide caption

Researchers have won a prize for discovering that a cow's genetics determine which microbes populate its gut. Some of those microbes produce the greenhouse gas methane that comes out of cow belches and farts and ends up in the atmosphere. Charlie Litchfield/AP hide caption

At the Cathedral Ridge Winery in Hood River, Ore., smoke has poured into the property and there are worries it could alter the taste of the grapes. Molly Solomon/OPB hide caption

Fallen fruit sits on the ground below orange trees in Frostproof, Fla., U.S. Hurricane Irma destroyed almost half of the citrus crop in some areas. Daniel Acker/Bloomberg/Getty Images hide caption

Faith with her beloved tomato seedlings. Courtesy of the family hide caption

Not only are kids raising animals and learning the how-tos of vaccinations and record-keeping, 4-H'ers are also being taught how to add up the costs and weigh them against future profits. Darren Huck/The Washington Post/Getty Images hide caption

In the upper reaches of the northern state of Uttarakhand, small villages are rain- and snow-fed. As snowfall has declined, farmers are starting to plant crops in winter, when fields would usually lie fallow. Julie McCarthy/NPR hide caption

Children walk through a rice field outside the town of Kelilalina in eastern Madagascar. Rice is the dominant food and the dominant crop on the Indian Ocean island, but changing weather patterns are disrupting production in some parts of the country. Samantha Reinders for NPR hide caption

The teal blue area along the Louisiana coastline represents a "dead zone" of oxygen-depleted water. Resulting from nitrogen and phosphorus pollution in the Mississippi River, it can potentially hurt fisheries. NASA/Getty Images hide caption

Dead Canary Islands date palms, killed by red palm weevils, line a road in La Mersa, Tunis, Tunisia. Courtesy of Mark Hoddle/Department of Entomology, University of California Riverside hide caption