A protective face mask is seen on the pavement in Paris during a lockdown imposed to slow the rate of the coronavirus disease (COVID-19) in France, April 24, 2020. REUTERS/Charles Platiau 

A discarded mask is seen on the ground, as the global outbreak of coronavirus disease (COVID-19) continues, in Los Angeles, California, U.S., April 23, 2020. REUTERS/Lucy Nicholson 

A discarded face mask is seen on the floor, as the spread of the coronavirus disease (COVID-19) continues, in Northwich, Britain April 23, 2020. REUTERS/Molly Darlington 

A face mask used to protect from the coronavirus disease (COVID-19) is seen on the grass near a logistics center in Lauwin-Planque, northern France, April 22, 2020. REUTERS/Pascal Rossignol 

A protective face mask lies on the street at Trastevere district as the spread of coronavirus disease (COVID-19) continues in Rome, Italy, April 19, 2020. REUTERS/Alberto Lingria 

A protective face mask lies on the street at Trastevere district as the spread of coronavirus disease (COVID-19) continues in Rome, Italy, April 19, 2020. REUTERS/Alberto Lingria 

A protective face mask lies on the street during the lockdown following the coronavirus disease (COVID-19) outbreak in Ronda, southern Spain, April 19, 2020. REUTERS/Jon Nazca 

A beggar sleeps in front of the Church of the Sacred Heart of Jesus, in Turin, Italy April 5, 2020. REUTERS/Massimo Pinca 

A protective face mask is seen in the rain at a deserted street, during the coronavirus disease (COVID-19) outbreak in Madrid, Spain, March 31, 2020. REUTERS/Susana Vera TPX IMAGES OF THE DAY 

A medical glove resembling the continental United States is seen on the sidewalk in Jackson Heights, Queens, New York City, U.S. March 17, 2020. REUTERS/Nick Zieminski 

A woman from Honduras, who crossed through the Rio Grande river into the United States from Mexico on a raft, dries her feet, in Penitas, Texas, U.S., March 20, 2019. REUTERS/Adrees Latif SEARCH "RIO GRANDE PATROL" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. 

A woman from Honduras, who crossed through the Rio Grande river into the United States from Mexico on a raft, dries her feet, in Penitas, Texas, U.S., March 20, 2019. REUTERS/Adrees Latif SEARCH "RIO GRANDE PATROL" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. 

An inner view shows a pigpen at a village in Henan province, China January 13, 2020. Picture taken January 13, 2020. To match Special Report SWINEFEVER-CHINA/EPIDEMIC REUTERS/Jason Lee 

Ducks are seen in a pigpen at a village in Henan province, China January 14, 2020. Picture taken January 14, 2020. To match Special Report SWINEFEVER-CHINA/EPIDEMIC REUTERS/Jason Lee 

Children from the indigenous Wichi community pose for a photograph barefoot, in the Salta province, Argentina, February 27, 2020. Picture taken February 27, 2020. REUTERS/Ueslei Marcelino 

A flooded street is pictured after heavy rainfall in Tiquipaya, Bolivia, February 22, 2020. REUTERS/Danilo Balderrama 

Pigs are seen in a breeding farm near the city of Katerini in northern Greece, February 6, 2020. REUTERS/Alexandros Avramidis 

Pigs are seen in a breeding farm near the city of Katerini in northern Greece, February 6, 2020. REUTERS/Alexandros Avramidis 

Pigs are seen in a breeding farm near the city of Katerini in northern Greece, February 6, 2020. REUTERS/Alexandros Avramidis 

Insects breeding are pictured on stagnant water pools which could server as potential breeding sites of Aedes aegypti mosquitoes, known to spread the dengue fever, in Hodeidah, Yemen January 20, 2020. Picture taken January 20, 2020. REUTERS/Abduljabbar Zeyad 

A placard of Uncle Sam sits outside a house at Indianola, Iowa, U.S., January 23, 2020. REUTERS/Ivan Alvarado 

A blackboard, with an old train schedule written on it, hangs at the decommissioned Voi train station in Voi, Kenya, November 13, 2019. REUTERS/Baz Ratner SEARCH "MOMBASA-NAIROBI TRAIN" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. 

Urinals are filled with volcanic ash in a closed park in Tagaytay City, Philippines, January 14, 2020. REUTERS/Eloisa Lopez 

Algae are seen in a fishing net near Mekong river bank outside Nong Khai, Thailand January 10, 2020. REUTERS/Soe Zeya Tun 

Algae are seen in a fishing net on the Mekong river bank outside Nong Khai, Thailand January 10, 2020. REUTERS/Soe Zeya Tun 

Sheep graze in a field on a farm near Appleby in Cumbria, Britain January 9 2020. REUTERS/Phil Noble 

A Sheep is seen in a field on a farm near Appleby in Cumbria, Britain January 9 2020. REUTERS/Phil Noble 

The white bark of ghost gums are stained red after a fire passed through yesterday near Milton, Australia January 5, 2020. REUTERS/Tracey Nearmy 

A potter makes earthenware oil lamps or "Diyo" used to decorate temples and homes ahead of Tihar festival, also called Diwali, the Hindu festival of lights, in Bhaktapur, Nepal October 20, 2019. REUTERS/Navesh Chitrakar 

A potter makes earthenware oil lamp or "Diyo" used to decorate temples and homes ahead of Tihar festival, also called Diwali, the Hindu festival of lights, in Bhaktapur, Nepal October 20, 2019. REUTERS/Navesh Chitrakar 

View of a camp for refugees and migrants following a fire on the island of Samos, Greece, October 15, 2019. REUTERS/Samiaki TV 

A pipe with a bottle attached to the end is seen outside a house in Aurangabad, India, August 2, 2019. REUTERS/Francis Mascarenhas 

Recently-harvested coffee fruits are pictured at a plantation in Tepezonapa, in Veracruz state, Mexico, August 14, 2019. Picture taken Agosto 14, 2019. REUTERS/Edgard Garrido 

The hands of a man are pictured as he makes earthenware in Bhaktapur, Nepal, September 26, 2019. REUTERS/Monika Deupala 

Guns hang with a hammock on the wall of a Tembe indigenous tribe's house, who are facing a conflict with illegal loggers on their land, in Teko-haw indigenous village near Paragominas, Para state, Brazil September 11, 2019. Picture taken September 11, 2019. REUTERS/Ricardo Moraes 

The Norwegian Sea is seen from the window of an atmospheric research aircraft during a flight across the Arctic Circle from northern Sweden, July 30, 2019. Picture taken July 30, 2019. REUTERS/Hannah McKay 

A worker picks coffee fruits at a plantation in Pueblorrico, Colombia March 11, 2019. Picture taken March 11, 2019. REUTERS/Luisa Gonzalez 

Monkeys collect lotus in a lake to eat as food, at a temple near Angkor Wat, in Siem Reap, Cambodia August 19, 2019. REUTERS/Soe Zeya Tun 

A cat is pictured among plastic waste at a fishermen port on the outskirts of Dakar, Senegal July 26, 2019. Picture taken July 26, 2019. REUTERS/Zohra Bensemra 

Plastic wastes is seen at a fishermen port on the outskirts of Dakar, Senegal July 26, 2019. Picture taken July 26, 2019. REUTERS/Zohra Bensemra 

A cat sits on a chair at a fishermen port on the outskirts of Dakar, Senegal July 26, 2019. Picture taken July 26, 2019.REUTERS/Zohra Bensemra 

An informal gold miner adds mercury to panned material to suck the gold out of the dirt at the site of Nsuaem-Top in Ghana, November 23, 2018. Picture taken November 23, 2018. To match Special Report GOLD-AFRICA/POISON REUTERS/Zohra Bensemra 

Plastic waste pile and debris are seen up near the beach in Panama City, as Panama becomes the first country in Central America to ban all single-use plastic bags, in Panama July 19, 2019. Picture taken July 19, 2019. REUTERS/ Erick Marciscano 

Plastic waste pile and debris are seen up near the beach in Panama City, as Panama becomes the first country in Central America to ban all single-use plastic bags, in Panama July 19, 2019. Picture taken July 19, 2019. REUTERS/ Erick Marciscano 

Plastic waste pile and debris are seen up near the beach in Panama City, as Panama becomes the first country in Central America to ban all single-use plastic bags, in Panama July 19, 2019. Picture taken July 19, 2019. REUTERS/ Erick Marciscano 

Blood is seen on a spear used by a "picador" (mounted bullfighter) during a bullfight at the San Fermin festival in Pamplona, Spain, July 10, 2019. REUTERS/Susana Vera 

A general view shows pipes on the outside wall of a residential apartment block in Hong Kong, China, June 29, 2019. REUTERS/Thomas Peter SEARCH "YOUNG HK" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. 

Damage is seen inside a building that was hit by a rocket fired from Gaza at the Israeli border town of Sderot, Israeli police said June 13, 2019. REUTERS/Amir Cohen 

A Palestinian worker makes clay pots at a pottery workshop in Gaza City June 11, 2019. REUTERS/Mohammed Salem 

A man has his finger stained with ink during the second day of the referendum on draft constitutional amendments, at a polling station in Cairo, Egypt April 21, 2019. REUTERS/Amr Abdallah Dalsh 

A man has his finger stained with ink during the second day of the referendum on draft constitutional amendments, at a polling station in Cairo, Egypt April 21, 2019. REUTERS/Amr Abdallah Dalsh 

A voter dips his finger in ink during the referendum on draft constitutional amendments, at a polling station in Cairo, Egypt April 20, 2019. REUTERS/Mohamed Abd El Ghany 

Participants take part in the Mud Run event in Tel Aviv, Israel March 29, 2019. REUTERS/Corinna Kern 

A worker covers firecrackers with gunpowder in a makeshift fireworks factory ahead of New Year celebrations in Bocaue, Bulacan province, Philippines, December 28, 2018. REUTERS/Eloisa Lopez TPX IMAGES OF THE DAY 

A worker covers firecrackers with gunpowder in a makeshift fireworks factory ahead of New Year celebrations in Bocaue, Bulacan province, Philippines, December 28, 2018. REUTERS/Eloisa Lopez 

A Palestinian worker carves a figurine for sale during Christmas season, at a workshop in Bethlehem in the occupied West Bank, December 10, 2018. REUTERS/Raneen Sawafta 

A group of tourists ride beach buggies in Wadi Billi, at El-Gouna near the Red Sea, Egypt November 14, 2018. Picture taken November 14, 2018. REUTERS/Mohamed Abd El Ghany 

The interior of a deserted church is seen in an area recently cleared of mines and unexploded ordnance in a project to clear the area near Qasr Al-Yahud, a traditional baptism site along the Jordan River, near Jericho in the occupied West Bank, December 9, 2018. REUTERS/Ammar Awad 

Dolls belonging to a migrant, part of a caravan of thousands from Central America trying to reach the United States, is seen on the ground at the border between U.S. and Mexico, December 7, 2018. REUTERS/Mohammed Salem 

A doll belonging to a migrant, part of a caravan of thousands from Central America trying to reach the United States, is seen on the floor in a temporary shelter in Tijuana, Mexico, November 29, 2018. REUTERS/Hannah McKay TPX IMAGES OF THE DAY