Workers plant maguey at the Del Razo family's Rancho San Isidro farm and pulque production facility in Nanacamilpa, Mexico, on Thursday, Dec. 3, 2015. Pulque, a traditional Mexican alcoholic beverage dating back to Aztec times, is made from honey water that is extracted from the maguey plant. Photo credit: Susana Gonzalez / Bloomberg via Getty Images.
Japan's Utsunomiya University demonstrates a robot that picks ripe strawberries during a demonstration at the annual International Robot Exhibition in Tokyo on December 2, 2015. Some 450 companies and organisations displayed their latest robots and 5,000 people were expecting to visit a four-day event. Photo credit: AFP / YOSHIKAZU TSUNO / Getty Images.
Shepherds rest next to their herds of longhorned zebus at a public, riverside abattoir in the Muslim PK5 district in Bangui on December 4, 2015. The animals, which are ritually slaughtered according to the precepts of Islam, produce the meat that provides for the needs of the enclaved muslim population. Photo credit: AFP / MARCO LONGARI / Getty Images.
The shepherd Adelino Timoteo strokes his shepherd dog as he listens to his sheep's 'chocalhos' (cattle bells) in Alcacovas, Alentejo, south of Portugal on December 3, 2015. Chocaleira craftwork was listed as Intangible Cultural Heritage in Need of Urgent Safeguarding by UNESCO on December 1, 2015. The village of Alcacovas is one of the 3 locations in Portugal where this art is still made by the Chocalheiros masters at Pardalinho factory and this international recognition could get the interest of young artisans. Photo credit: AFP / PATRICIA DE MELO MOREIRA / Getty Images.
A chilled pizza sits in the fridge on display at the Tesco Basildon Pitsea Extra supermarket, operated by Tesco Plc, in Basildon, U.K., on Tuesday, Dec. 1, 2015. Many European food retailers are coming to terms with persistently low inflation as well as consumers who remain frugal yet purchase food more frequently. Photo credit: Chris Ratcliffe / Bloomberg via Getty Images.
A picture shows a field where no-till farming is used in Piace, northwestern France, on November 30, 2015. French farmer Nicolas Denieul plants his spade in the ground and turns over a clod of soil to reveal a mass of earthworms seething around plant roots -- fat ones and thin ones, delicate translucent violet and dark brown. Photo credit: AFP / JEAN-FRANCOIS MONIER / Getty Images.
French farmer Nicolas Denieul holds a pig on November 30, 2015 next to his breeding of 350 Large White sows, in Piace, north-western France. Pigs are fed by farm crops, practicing rational agriculuture, namely zero tillage seeding directly or indirectly on a surface of 310 hectares operated GAEC (Groupement Agricole d'Exploitation en Commun). 5000 French farmers, representing 5% of them have abandoned the plow in favor of direct or indirect planting. The farmer then simply drop the seeds in a thin layer of freshly dug earth. No more furrows plows, the long hours of tractors up to the work of earthworms which absorb and digest dead plants before the green manure spread in the rest of the soil. The organic matter content of soils operated by Nicolas Denieul happened in 10 years from 1.5 to 3. Photo credit: AFP / JEAN-FRANCOIS MONIER / Getty Images.
Sacks of pasta are displayed for sale at a stall in Karachi, Pakistan, on Wednesday, Dec. 2, 2015. A committee of Pakistan's top economic minds will set the benchmark interest rate starting early next year, as the central bank takes its biggest step yet toward greater autonomy. Photo credit: Asim Hafeez / Bloomberg via Getty Images.
Visitors haul away Christmas trees they sawed down themselves at the Werderaner Tannenhof Christmas tree farm on December 5, 2015 in Werder, Germany. The Christmas season is in high gear in Germany and a proper, fully decorated Christmas tree is an essental part of Germany's Christmas tradition. Photo Credit: Sean Gallup / Getty Images.