A child pushes a cart selling cooked sweetcorn in Douma, outside Damascus, Syria, September 17, 2018. The town of Douma in eastern Ghouta was retaken by the government from rebels in April after heavy fighting and intense army bombardment and air strikes. REUTERS/Marko Djurica SEARCH "SYRIA LIFE" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.

Sacks of different varieties of corn grain are displayed at a market in Mexico City, Mexico, May 19, 2017. REUTERS/Henry Romero

Sacks of different varieties of corn grain are displayed at a market in Mexico City, Mexico, May 19, 2017. REUTERS/Henry Romero

Sacks of different varieties of corn grain are displayed at a market in Mexico City, Mexico, May 19, 2017. REUTERS/Henry Romero

A variety of corn grain is displayed at a market in Mexico City, Mexico, May 19, 2017. REUTERS/Henry Romero

A variety of corn grain is displayed at a market in Mexico City, Mexico, May 19, 2017. REUTERS/Henry Romero

A vendor shows corn cobs at a market in Mexico City, Mexico May 19, 2017. REUTERS/Henry Romero

Corn cobs and yellow corn are on display at a market in Mexico City, Mexico May 19, 2017. REUTERS/Henry Romero

Yellow corns are on display at a market in Mexico City, Mexico May 19, 2017. REUTERS/Henry Romero

Yellow corn from Mexico are on display at a market in Mexico City, Mexico May 19, 2017. REUTERS/Henry Romero

Yellow corn from Mexico are on display at a market in Mexico City, Mexico May 19, 2017. REUTERS/Henry Romero

Yellow corn are on display at a market in Mexico City, Mexico May 19, 2017. REUTERS/Henry Romero

Corn is displayed in a street market in Montevideo's downtown, May 17, 2017. REUTERS/Andres Stapff

A farmer shows corn kernels in Otzolotepec, on the outskirts of Mexico City, February 7, 2017. Picture taken February 7, 2017. REUTERS/Carlos Jasso

A farmer holds corn kernels in Otzolotepec, on the outskirts of Mexico City, February 7, 2017. Picture taken February 7, 2017. REUTERS/Carlos Jasso

A farmer holds different types of corn cobs in Otzolotepec, on the outskirts of Mexico City, February 7, 2017. Picture taken February 7, 2017. REUTERS/Carlos Jasso

A farmer holds corn kernels at a farm in Otzolotepec, on the outskirts of Mexico City, February 7, 2017. Picture taken February 7, 2017. REUTERS/Carlos Jasso

A farmer holds a corn cob at a farm in Otzolotepec, on the outskirts of Mexico City, February 7, 2017. Picture taken February 7, 2017. REUTERS/Carlos Jasso

A corn cob is seen at a farm in Otzolotepec, on the outskirts of Mexico City, February 7, 2017. Picture taken February 7, 2017. REUTERS/Carlos Jasso

An employee checks cans of sweetcorn in the packaging chain at French food group Bonduelle's plant in Borderes-et-Lamensas, Southwestern France, March 16, 2017. REUTERS/Regis Duvignau

An employee checks cans of sweetcorn in the packaging chain at French food group Bonduelle's plant in Borderes-et-Lamensas, Southwestern France, March 16, 2017. REUTERS/Regis Duvignau

Cans of sweetcorn are pictured in the packaging chain at French food group Bonduelle's plant in Borderes-et-Lamensas, Southwestern France, March 16, 2017. REUTERS/Regis Duvignau

Cans of sweetcorn are pictured in the packaging chain at French food group Bonduelle's plant in Borderes-et-Lamensas, Southwestern France, March 16, 2017. REUTERS/Regis Duvignau

Cans of sweetcorn are pictured in the packaging chain at French food group Bonduelle's plant in Borderes-et-Lamensas, Southwestern France, March 16, 2017. REUTERS/Regis Duvignau

Cans of sweetcorn are pictured in the packaging chain at French food group Bonduelle's plant in Borderes-et-Lamensas, Southwestern France, March 16, 2017. REUTERS/Regis Duvignau

An employee check cans of sweetcorn at French food group Bonduelle's plant in Borderes-et-Lamensas, Southwestern France, March 16, 2017. REUTERS/Regis Duvignau

An employee check cans of sweetcorn at French food group Bonduelle's plant in Borderes-et-Lamensas, Southwestern France, March 16, 2017. REUTERS/Regis Duvignau

Cans of sweetcorn are pictured in the packaging chain at French food group Bonduelle's plant in Borderes-et-Lamensas, Southwestern France, March 16, 2017. REUTERS/Regis Duvignau

Cans of sweetcorn are pictured in the packaging chain at French food group Bonduelle's plant in Borderes-et-Lamensas, Southwestern France, March 16, 2017. REUTERS/Regis Duvignau

Cans of sweetcorn are pictured in the packaging chain at French food group Bonduelle's plant in Borderes-et-Lamensas, Southwestern France, March 16, 2017. REUTERS/Regis Duvignau

Cans of sweetcorn are pictured on the packaging chain at French food group Bonduelle's plant in Borderes-et-Lamensas, Southwestern France, March 16, 2017. REUTERS/Regis Duvignau

Cans of sweetcorn are pictured on the packaging chain at French food group Bonduelle's plant in Borderes-et-Lamensas, Southwestern France, March 16, 2017. REUTERS/Regis Duvignau

Cans of sweetcorn are pictured on the packaging chain at French food group Bonduelle's plant in Borderes-et-Lamensas, Southwestern France, March 16, 2017. REUTERS/Regis Duvignau

Cans of sweetcorn are pictured on the packaging chain at French food group Bonduelle's plant in Borderes-et-Lamensas, Southwestern France, March 16, 2017. REUTERS/Regis Duvignau

Cans of sweetcorn are pictured on the packaging chain at French food group Bonduelle's plant in Borderes-et-Lamensas, Southwestern France, March 16, 2017. REUTERS/Regis Duvignau

Cans of sweetcorn are pictured on the packaging chain at French food group Bonduelle's plant in Borderes-et-Lamensas, Southwestern France, March 16, 2017. REUTERS/Regis Duvignau

Cans of sweetcorn are pictured on the packaging chain at French food group Bonduelle's plant in Borderes-et-Lamensas, Southwestern France, March 16, 2017. REUTERS/Regis Duvignau

Cans of sweetcorn are pictured on the packaging chain at French food group Bonduelle's plant in Borderes-et-Lamensas, Southwestern France, March 16, 2017. REUTERS/Regis Duvignau

Cans of sweetcorn are pictured on the packaging chain at French food group Bonduelle's plant in Borderes-et-Lamensas, Southwestern France, March 16, 2017. REUTERS/Regis Duvignau

Cans of sweetcorn are pictured on the packaging chain at French food group Bonduelle's plant in Borderes-et-Lamensas, Southwestern France, March 16, 2017. REUTERS/Regis Duvignau

Cans of sweetcorn are pictured on the packaging chain at French food group Bonduelle's plant in Borderes-et-Lamensas, Southwestern France, March 16, 2017. REUTERS/Regis Duvignau

Cans of sweetcorn are pictured on the packaging chain at French food group Bonduelle's plant in Borderes-et-Lamensas, Southwestern France, March 16, 2017. REUTERS/Regis Duvignau

Cans of sweetcorn are pictured on the packaging chain at French food group Bonduelle's plant in Borderes-et-Lamensas, Southwestern France, March 16, 2017. REUTERS/Regis Duvignau

Cans of sweetcorn are pictured on the packaging chain at French food group Bonduelle's plant in Borderes-et-Lamensas, Southwestern France, March 16, 2017. REUTERS/Regis Duvignau

Cans of sweetcorn are pictured on the packaging chain at French food group Bonduelle's plant in Borderes-et-Lamensas, Southwestern France, March 16, 2017. REUTERS/Regis Duvignau

Cans of sweetcorn are pictured in a plant of French food group Bonduelle at Borderes-et-Lamensas, Southwestern France, March 16, 2017. REUTERS/Regis Duvignau

Men sort corn at a vegetable market in Lahore December 29, 2010. REUTERS/Mohsin Raza (PAKISTAN - Tags: BUSINESS AGRICULTURE)

Farmer Tom Chino holds baby corn as he inspects the crop at his family farm in Rancho Santa Fe, California October 5, 2007. Even in these days of ubiquitous farmers' markets replete with heirloom crops and ethnic treats, the Chino stand offers a mind-boggling array of crops, organically farmed and picked fresh that morning from the 45-acre agricultural oasis hemmed in by luxurious homes, golf courses and equestrian centers in one of San Diego's most affluent suburbs.Picture taken October 5, 2007. To match feature CALIFORNIA-FARM/ REUTERS/Mike Blake (UNITED STATES)

Sweet corn is seen in the field at Chino's family farm in Rancho Santa Fe, California October 5, 2007. Even in these days of ubiquitous farmers' markets replete with heirloom crops and ethnic treats, the Chino stand offers a mind-boggling array of crops, organically farmed and picked fresh that morning from the 45-acre agricultural oasis hemmed in by luxurious homes, golf courses and equestrian centers in one of San Diego's most affluent suburbs.Picture taken October 5, 2007. To match feature CALIFORNIA-FARM/ REUTERS/Mike Blake (UNITED STATES)

An anti-GMO activist dressed as U.S. President George W. Bush pulls the
strings on another dressed as European Trade Commissioner Pascal Lamy,
distributing genetically modified (GM) sweetcorn in Brussels on
November 10, 2003. The protest in front of the European Council
building by Friends of the Earth came as the European Union was set to
vote on Monday on importing GM sweetcorn for use in food production,
which could clear the way for a range of new biotech products.
REUTERS/Thierry Roge REUTERS

THR

An anti-GMO activist dressed as U.S. President George W. Bush pulls the
strings on another dressed as European Trade Commissioner Pascal Lamy,
distributing genetically modified (GM) sweetcorn in Brussels on
November 10, 2003. The protest in front of the European Council
building by Friends of the Earth came as the European Union was set to
vote on Monday on importing GM sweetcorn for use in food production,
which could clear the way for a range of new biotech products.
REUTERS/Thierry Roge REUTERS

THR