An employee gets pork balls for a customer at a restaurant in Beijing, China, November 12, 2019. REUTERS/Jason Lee

A waste collection pond is shown at a dairy farm in Pixley, California, U.S., October 2, 2019. Picture taken October 2, 2019. REUTERS/Mike Blake

Typical German Currywurst (curried sausage) is pictured in Berlin, Germany, September 3, 2019. Picture taken September 3, 2019. REUTERS/Hannibal Hanschke

Typical German Currywurst (curried sausage) is pictured in Berlin, Germany, September 3, 2019. Picture taken September 3, 2019. REUTERS/Hannibal Hanschke

Typical German Currywurst (curried sausage) is pictured in Berlin, Germany, September 3, 2019. Picture taken September 3, 2019. REUTERS/Hannibal Hanschke

Typical German Currywurst (curried sausage) is pictured in Berlin, Germany, September 3, 2019. Picture taken September 3, 2019. REUTERS/Hannibal Hanschke

A tourist takes pictures of typical German Currywurst (curried sausage) in Berlin, Germany, September 3, 2019. Picture taken September 3, 2019. REUTERS/Hannibal Hanschke

An employee of the famous snack bar "Konnopke's Imbiss" prepares typical German Currywurst (curried sausage) in Berlin, Germany, September 3, 2019. Picture taken September 3, 2019. REUTERS/Hannibal Hanschke

Typical German Currywurst (curried sausage) is pictured in Berlin, Germany, September 3, 2019. Picture taken September 3, 2019. REUTERS/Hannibal Hanschke

Typical German Currywurst (curried sausage) is pictured in Berlin, Germany, September 3, 2019. Picture taken September 3, 2019. REUTERS/Hannibal Hanschke

Hot dogs are displayed during the official weigh-in ceremony for the Nathan's Famous Fourth of July International Hot Dog Eating Contest at the Empire State Building in New York, U.S., July 3, 2019. REUTERS/Brendan McDermid

A vendor makes fast food for customers at a mobile cart on a rainy evening in Colombo, Sri Lanka April 18, 2019. REUTERS/Dinuka Liyanawatte

Used single-serve coffee capsules are pictured at a recycling center in Bordeaux, France, April 2, 2019. REUTERS/Regis Duvignau

Used single-serve coffee capsules are pictured at a recycling center in Bordeaux, France, April 2, 2019. REUTERS/Regis Duvignau

Bundles of pressed PET (polyethylene terephthalate) bottles made out of plastic are seen at the Transcycle Transport & Recycling AG company in Neuenhof, Switzerland November 22, 2018. Picture taken November 22, 2018. REUTERS/Arnd Wiegmann

Plastic straws are on display in a shop in Nice, France, November 22, 2018. REUTERS/Eric Gaillard

Plastic straws are on display in a shop in Nice, France, November 22, 2018. REUTERS/Eric Gaillard

Plastic straws are on display in a shop in Nice, France, November 22, 2018. REUTERS/Eric Gaillard

Plastic straws are on display in a shop in Nice, France, November 22, 2018. REUTERS/Eric Gaillard

Plastic drinking straws are on display in a shop in Nice, France, November 22, 2018. REUTERS/Eric Gaillard

French fries are prepared at 'BurgerArt' restaurant, as drought and heat wave in Europe this summer could cause a shortage of potatoes in Berlin, Germany, July 30, 2018. REUTERS/Fabrizio Bensch

French fires are pictured at 'BurgerArt' restaurant, as drought and heat wave in Europe this summer could cause a shortage of potatoes in Berlin, Germany, July 30, 2018. REUTERS/Fabrizio Bensch

French fries are prepared at 'BurgerArt' restaurant, as drought and heat wave in Europe this summer could cause a shortage of potatoes in Berlin, Germany, July 30, 2018. REUTERS/Fabrizio Bensch

A grey mullet is shown next to microplastic found in Hong Kong waters during a Greenpeace news conference in Hong Kong, China, April 23, 2018. REUTERS/Bobby Yip TPX IMAGES OF THE DAY

Pre-consumer food waste is stockpiled before being feed to black soldier fly larvae at the Enterra Feed Corporation in Langley, British Columbia, Canada, March 14, 2018. Picture taken March 14, 2018. REUTERS/Ben Nelms

A vegan oat and chickpeas hamburger is pictured at Tasty Beet Juicy and Healthy Food restaurant in Ciudad Juarez, Mexico January 29, 2018. Picture taken January 29, 2018. REUTERS/Jose Luis Gonzalez

A Veganburg vegan hamburger is seen in this illustration photo January 30, 2018. REUTERS/Thomas White/Illustration

A Veganburg vegan hotdog is seen in this illustration photo January 30, 2018. REUTERS/Thomas White/Illustration

A customer prepares pork meat sandwich wait at a food truck in Sao Paulo, Brazil October 1, 2017. REUTERS/Paulo Whitaker

A woman holds a "Cuoppo", a paper cone with a mix of deep-fried foods, in downtown Naples, south Italy, September 29, 2017. REUTERS/Ciro De Luca

A worker prepares a sandwich in the Duran sandwich shop in Vienna, Austria September 29, 2017. REUTERS/Leonhard Foeger

A bowl of Vietnamese chicken noodle soup (Pho) is seen at a restaurant in Hanoi, Vietnam September 28, 2017. REUTERS/Kham

A beef burger from "Eish & Malh" (or "Bread and Salt") is seen in the capital Cairo, Egypt September 26, 2017. REUTERS/Amr Abdallah Dalsh

An employee prepares food orders at the Isla Burger Halal fast-food in Nice, France, September 25, 2017. REUTERS/Eric Gaillard

A cook prepares a souvlaki, a popular Greek fast food with pieces of meat on a skewer, in a restaurant in Athens, Greece, July 28, 2017. REUTERS/Alkis Konstantinidis

A beef steak is cut at the Taberna del Gijon restaurant in Madrid, Spain, July 26, 2017. REUTERS/Paul Hanna

A pork steak is grilled in the village of Krompach, near Cvikov, Czech Republic July 22, 2017. Picture taken July 22, 2017. REUTERS/David W Cerny

A man grills meat at his home in Buenos Aires, Argentina July 23, 2017. REUTERS/Marcos Brindicci

A packing area is seen after a job at a banana plantation operated by a Chinese company in the province of Bokeo in Laos April 26, 2017. REUTERS/Jorge Silva SEARCH "SILVA BANANA" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.

A packing area is seen after a job at a banana plantation operated by a Chinese company in the province of Bokeo in Laos April 26, 2017. REUTERS/Jorge Silva SEARCH "SILVA BANANA" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.

A woman eats her purchases in a window of a McDonald's restaurant in London, Britain December 9, 2016. REUTERS/Neil Hall

Demonstrators in the "Fight for $15" wage protest are joined by social justice activists at a rally in downtown San Diego, California, U.S., November 29, 2016. REUTERS/Mike Blake

Paul Pomroy, Chief Executive Officer McDonald's UK attends the Confederation of British Industry's (CBI) annual conference in London, Britain November 21, 2016. REUTERS/Stefan Wermuth

A boy drinks expired juice on a pile of rubbish at landfill site on the outskirts of Sanaa, Yemen November 16, 2016. REUTERS/Mohamed al-Sayaghi

Britain Football Soccer - West Bromwich Albion v Tottenham Hotspur - Premier League - The Hawthorns - 15/10/16
General view of a fan eating food before the game
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People walk under a broken Kentucky Fried Chicken sign that blew over in Hurricane Matthew in Nassau, Bahamas October 7, 2016. REUTERS/Carlo Allegri TPX IMAGES OF THE DAY

A KFC sign damaged by Hurricane Matthew is supported by utility lines on Carmichael Road in Nassau, Bahamas October 6, 2016. REUTERS/Dante Carrer TPX IMAGES OF THE DAY

The logo of Burger King is seen outside a shop in Vienna in Vienna, Austria, October 1, 2016. REUTERS/Leonhard Foeger - RTX2HDG8

The logo of McDonalds is seen outside a shop in Vienna in Vienna, Austria, October 1, 2016. REUTERS/Leonhard Foeger -

FILE PHOTO -- Logos of KFC, owned by Yum Brands Inc, are seen on its delivery bicycles in front of its restaurant in Beijing February 25, 2013. REUTERS/Kim Kyung-Hoon/File Photo

An employee at a fast-food restaurant in a shopping mall uses her mobile phone during a power outage that affected several areas in the country, in San Juan, Puerto Rico, September 21, 2016. REUTERS/Alvin Baez

A McDonald's logo is seen outside a store in Johannesburg, South Africa, September 20, 2016. REUTERS/Siphiwe Sibeko

Pokeburgs, hamburgers in the form of Pokemon characters, are seen at Down N' Out Burger restaurant in Sydney, Australia, August 26, 2016. The restaurant sells a limited number of Pokeburgs per day, with the names (L-R) Chugmander, Peakachu and Bulboozaur, capitalizing on fans' appetite for Pokemon Go, the location-based augmented reality game. REUTERS/Jason Reed TPX IMAGES OF THE DAY

A plate of traditional fish and chips with a gherkin on a table in a seafront fish and chip shop in Brighton, Britain, December 22, 2015. REUTERS/Russell Boyce/File Photo

The logo of McDonald's (MCD) is seen in Los Angeles, California, United States, April 22, 2016. REUTERS/Lucy Nicholson/File Photo

A sign featuring mens winner Joey Chestnut is held above the crowd during Nathan's Famous Fourth of July International Hot Dog-Eating Contest at Coney Island in Brooklyn, New York, U.S., July 4, 2016. REUTERS/Andrew Kelly

The female entrants compete during Nathan's Famous Fourth of July International Hot Dog-Eating Contest at Coney Island in Brooklyn, New York, U.S., July 4, 2016. REUTERS/Andrew Kelly

The female entrants compete during Nathan's Famous Fourth of July International Hot Dog-Eating Contest at Coney Island in Brooklyn, New York, U.S., July 4, 2016. REUTERS/Andrew Kelly

The male entrants compete during Nathan's Famous Fourth of July International Hot Dog-Eating Contest at Coney Island in Brooklyn, New York, U.S., July 4, 2016. REUTERS/Andrew Kelly

A cook pushes a rubbish bin in downtown Malaga, Spain, July 4, 2016. REUTERS/Jon Nazca