People prepare a net to fish in the Rio de la Plata river, which is affected by blue-green algae, also known as cyanobacteria, in Quilmes, on the outskirts of Buenos Aires, Argentina February 9, 2023. REUTERS/Matias Baglietto 

People stand by the shore of the Rio de la Plata river, which is affected by blue-green algae, also known as cyanobacteria, in Quilmes, on the outskirts of Buenos Aires, Argentina February 9, 2023. REUTERS/Matias Baglietto 

People bathe in the Rio de la Plata river, which is affected by blue-green algae, also known as cyanobacteria, in Quilmes, on the outskirts of Buenos Aires, Argentina February 9, 2023. REUTERS/Matias Baglietto 

People stand by the shore of the Rio de la Plata river, which is affected by blue-green algae, also known as cyanobacteria, in Quilmes, on the outskirts of Buenos Aires, Argentina February 9, 2023. REUTERS/Matias Baglietto 

People prepare a net to fish in the Rio de la Plata river, which is affected by blue-green algae, also known as cyanobacteria, in Quilmes, on the outskirts of Buenos Aires, Argentina February 9, 2023. REUTERS/Matias Baglietto 

A man walks by the shore of the Rio de la Plata river, which is affected by blue-green algae, also known as cyanobacteria, in Quilmes, on the outskirts of Buenos Aires, Argentina February 9, 2023. REUTERS/Matias Baglietto 

A man walks by the shore of the Rio de la Plata river, which is affected by blue-green algae, also known as cyanobacteria, in Quilmes, on the outskirts of Buenos Aires, Argentina February 9, 2023. REUTERS/Matias Baglietto 

The facilities of a fishermen's club are seen on the coast of the Rio de la Plata river, which is affected by blue-green algae, also known as cyanobacteria, in Quilmes, on the outskirts of Buenos Aires, Argentina February 9, 2023. REUTERS/Matias Baglietto TPX IMAGES OF THE DAY 

Ibrahima Samba Diop, 75, who is one of the beneficiary's of a Tolou Keur garden, checks plants, within the Great Green Wall target area in Kanel, Matam region, Senegal, July 13, 2021. Gardens known as 'Tolou Keur' hold plants and trees resistant to hot, dry climates, and are planted with circular beds that allow roots to grow inwards, trapping liquids and bacteria and improving water retention and composting. REUTERS/Zohra Bensemra SEARCH "BENSEMRA REFORESTATION" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES 

Trees to be planted, are pictured at a warehouse next to a Tolou Keur garden, within an area that is part of the Great Green Wall, in Boki Diawe, Matam region, Senegal, July 13, 2021. Gardens known as 'Tolou Keur' hold plants and trees resistant to hot, dry climates, and are planted with circular beds that allow roots to grow inwards, trapping liquids and bacteria and improving water retention and composting. REUTERS/Zohra Bensemra SEARCH "BENSEMRA REFORESTATION" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES 

Baydi Wague, 11, waters a newly planted tree at a Tolou Keur garden in Boki Diawe, within the Great Green Wall area, Matam region, Senegal, July 12, 2021. Gardens known as 'Tolou Keur' hold plants and trees resistant to hot, dry climates, and are planted with circular beds that allow roots to grow inwards, trapping liquids and bacteria and improving water retention and composting. REUTERS/Zohra Bensemra SEARCH "BENSEMRA REFORESTATION" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES TPX IMAGES OF THE DAY 

Moussa Kamara, 47, a baker and a Tolou Keur garden caretaker, shows a sketch of a Tolou Keur garden, which holds plants and trees resistant to hot, dry climates, and are planted with circular beds that allow roots to grow inwards, trapping liquids and bacteria and improving water retention and composting, as he speaks to journalists whilst sitting with his family members in a courtyard at his house in Boki Diawe, within the Great Green Wall area, in Matam region, Senegal, July 12, 2021. Kamara is part of a project that aims to create hundreds of such gardens - known as 'Tolou Keur' in Senegal's Wolof language - that organisers hope will boost food security, reduce regional desertification and engage thousands of community workers. "This project is incredibly important," said Kamara. "When you grow one tree, over 20 years people and animals will benefit from it."REUTERS/Zohra Bensemra SEARCH "BENSEMRA REFORESTATION" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES 

Moussa Kamara, 47, a baker and a Tolou Keur garden caretaker, prepares to plant a tree at a newly built Tolou Keur garden, which holds plants and trees resistant to hot, dry climates, and are planted with circular beds that allow roots to grow inwards, trapping liquids and bacteria and improving water retention and composting, in Boki Diawe, within the Great Green Wall area in Matam region, Senegal, July 12, 2021. Kamara is part of a project that aims to create hundreds of such gardens - known as 'Tolou Keur' in Senegal's Wolof language - that organisers hope will boost food security, reduce regional desertification and engage thousands of community workers. "This project is incredibly important," said Kamara. "When you grow one tree, over 20 years people and animals will benefit from it." REUTERS/Zohra Bensemra SEARCH "BENSEMRA REFORESTATION" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES 

Trees stand around a Tolou Keur garden in Walalde department of Podor, in the Great Green Wall of the Sahara and the Sahel area, Senegal, July 11, 2021. Gardens known as Tolou Keur hold plants and trees resistant to hot, dry climates, and are planted with circular beds that allow roots to grow inwards, trapping liquids and bacteria and improving water retention and composting. Picture taken with a drone. REUTERS/Zohra Bensemra SEARCH "BENSEMRA REFORESTATION" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES 

Aboulaziz Kome, 44, a carpenter, checks a chicken at a Tolou Keur garden in Walalde department of Podor, in an area that is part of the Great Green Wall of the Sahara and the Sahel area, in Senegal, July 11, 2021. Gardens known as 'Tolou Keur' hold plants and trees resistant to hot, dry climates, and are planted with circular beds that allow roots to grow inwards, trapping liquids and bacteria and improving water retention and composting. REUTERS/Zohra Bensemra SEARCH "BENSEMRA REFORESTATION" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES 

Thierno Com waters a tree that is struggling to grow at a Tolou Keur garden in Walalde department of Podor, in an area that is part of the Great Green Wall of the Sahara and the Sahel area, in Senegal, July 11, 2021. Gardens known as 'Tolou Keur' hold plants and trees resistant to hot, dry climates, and are planted with circular beds that allow roots to grow inwards, trapping liquids and bacteria and improving water retention and composting. REUTERS/Zohra Bensemra SEARCH "BENSEMRA REFORESTATION" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES 

A girl carries a jerrycan filled with water at a Tolou Keur garden in the Walalde department of Podor, in the Great Green Wall of the Sahara and the Sahel area, Senegal, July 11, 2021. Gardens known as 'Tolou Keur' hold plants and trees resistant to hot, dry climates, and are planted with circular beds that allow roots to grow inwards, trapping liquids and bacteria and improving water retention and composting. REUTERS/Zohra Bensemra SEARCH "BENSEMRA REFORESTATION" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES 

Mariama Ly, 51, attends a morning briefing at a newly built Tolou Keur garden in Boki Diawe, within the Great Green Wall area, in Matam region, Senegal, July 10, 2021. Garden's known as 'Tolou Keur' hold plants and trees resistant to hot, dry climates, and are planted with circular beds that allow roots to grow inwards, trapping liquids and bacteria and improving water retention and composting. REUTERS/Zohra Bensemra SEARCH "BENSEMRA REFORESTATION" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES 

Senegalese agricultural engineer Aly Ndiaye, who is the head of the training and green sectors division at the eco-villages department of the Senegalese Agency for Reforestation and the Great Green Wall, waters trees at a newly built Tolou Keur garden, in Boki Diawe, within the Great Green Wall area, Matam region, Senegal, July 10, 2021. Gardens known as 'Tolou Keur' hold plants and trees resistant to hot, dry climates, and are planted with circular beds that allow roots to grow inwards, trapping liquids and bacteria and improving water retention and composting. Ndiaye stressed the importance of "smaller actions that are permanent". "A thousand Tolou Keur is already 1.5 million trees," said Ndiaye. "So if we start, we can make a lot." REUTERS/Zohra Bensemra SEARCH "BENSEMRA REFORESTATION" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES 

Children carry wood that was collected for cooking, as they walk past a newly built a Tolou Keur garden in Boki Diawe, within the Great Green Wall area, in Matam region, Senegal, July 10, 2021. Gardens known as 'Tolou Keur' hold plants and trees resistant to hot, dry climates, and are planted with circular beds that allow roots to grow inwards, trapping liquids and bacteria and improving water retention and composting. REUTERS/Zohra Bensemra SEARCH "BENSEMRA REFORESTATION" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES 

Amadou Bathili, 50, a trainer who teaches how to build Tolou Keur gardens through the Tolou Keur programme, prepares a chicken cage at a newly built Tolou Keur garden in Boki Diawe department of Podor region, in an area which is part of the Great Green Wall of the Sahara and the Sahel area, in Senegal, July 10, 2021. Gardens known as 'Tolou Keur' hold plants and trees resistant to hot, dry climates, and are planted with circular beds that allow roots to grow inwards, trapping liquids and bacteria and improving water retention and composting. REUTERS/Zohra Bensemra SEARCH "BENSEMRA REFORESTATION" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES 

Moussa Kamara, 47, a baker and a Tolou Keur garden caretaker, helps to install a water reserve at a newly built Tolou Keur garden, which holds plants and trees resistant to hot, dry climates, and are planted with circular beds that allow roots to grow inwards, trapping liquids and bacteria and improving water retention and composting, in Boki Diawe, within the Great Green Wall area, in Matam region, Senegal, July 10, 2021. Kamara is part of a project that aims to create hundreds of such gardens - known as 'Tolou Keur' in Senegal's Wolof language - that organisers hope will boost food security, reduce regional desertification and engage thousands of community workers. "This project is incredibly important," said Kamara. "When you grow one tree, over 20 years people and animals will benefit from it." REUTERS/Zohra Bensemra SEARCH "BENSEMRA REFORESTATION" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES 

Khadidiatou Diouf, 32, a Tolou Keur programme trainer at the eco villages department of the Senegalese Agency for Reforestation and the Great Green Wall, shows how to install a watering system at newly built a Tolou Keur garden, in Boki Diawe, Matam region, Senegal, July 10, 2021. Gardens known as 'Tolou Keur' hold plants and trees resistant to hot, dry climates, and are planted with circular beds that allow roots to grow inwards, trapping liquids and bacteria and improving water retention and composting. REUTERS/Zohra Bensemra SEARCH "BENSEMRA REFORESTATION" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES 

An aerial view shows participants of a Tolou Keur programme working on a newly built Tolou Keur garden in Boki Diawe, within the Great Green Wall area, in Matam region, Senegal, July 10, 2021. Gardens known as Tolou Keur hold plants and trees resistant to hot, dry climates, and are planted with circular beds that allow roots to grow inwards, trapping liquids and bacteria and improving water retention and composting. Picture taken with a drone. REUTERS/Zohra Bensemra SEARCH "BENSEMRA REFORESTATION" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES TPX IMAGES OF THE DAY 

Almost 12 million residents in over 100 counties have been told to boil their drinking water after water-treatment plants lost power, which could allow harmful bacteria to proliferate. 

A sticker informing passengers about the task of anti-virus and bacteria coating procedures are displayed inside a railway car as employees of the Tokyo Metro sprays chemicals in order to prevent infections following the coronavirus disease (COVID-19) outbreak, at the Tokyo Metro's rail-yard in Tokyo, Japan July 9, 2020. REUTERS/Issei Kato 

An employee of the Tokyo Metro wearing a protective mask and goggles sprays chemicals for anti-virus and bacteria coating in order to prevent infections following the coronavirus disease (COVID-19) outbreak, inside a railway train at Tokyo Metro's rail-yard in Tokyo, Japan July 9, 2020. REUTERS/Issei Kato 

An employee of the Tokyo Metro wearing a protective mask and goggles sprays chemicals for anti-virus and bacteria coating in order to prevent infections following the coronavirus disease (COVID-19) outbreak, inside a railway train at the Tokyo Metro's rail-yard in Tokyo, Japan July 9, 2020. REUTERS/Issei Kato 

A sticker informing passengers about the task of anti-virus and bacteria coating procedure are displayed inside a railway car as employees of Tokyo Metro sprays chemicals in order to prevent infections following the coronavirus disease (COVID-19) outbreak, at the Tokyo Metro's rail-yard in Tokyo, Japan July 9, 2020. REUTERS/Issei Kato 

An employee of the Tokyo Metro wearing a protective mask and goggles sprays chemicals for anti-virus and bacteria coating in order to prevent infections following the coronavirus disease (COVID-19) outbreak, inside a railway train at the Tokyo Metro's rail-yard in Tokyo, Japan July 9, 2020. REUTERS/Issei Kato 

An employee of the Tokyo Metro wearing a protective mask and goggles sprays chemicals for anti-virus and bacteria coating in order to prevent infections following the coronavirus disease (COVID-19) outbreak, inside a railway train at the Tokyo Metro's rail-yard in Tokyo, Japan July 9, 2020. REUTERS/Issei Kato 

An employee of the Tokyo Metro wearing a protective mask and goggles sprays chemicals for anti-virus and bacteria coating in order to prevent infections following the coronavirus disease (COVID-19) outbreak, inside a railway train at the Tokyo Metro's rail-yard in Tokyo, Japan July 9, 2020. REUTERS/Issei Kato 

An employee of the Tokyo Metro wearing a protective mask and goggles sprays chemicals for anti-virus and bacteria coating in order to prevent infections following the coronavirus disease (COVID-19) outbreak, inside a railway train at the Tokyo Metro's rail-yard in Tokyo, Japan July 9, 2020. REUTERS/Issei Kato 

A man teaches his dog to find a piece of fabric that was infected with the COVID-19 bacteria during a training session at Alfortville national veterinary school in Maison-Alfort, near Paris, during the outbreak of the coronavirus disease (COVID-19) in France, May 19, 2020. Picture taken May 19, 2020. REUTERS/Benoit Tessier 

A man congratulates his dog during a training session with fabric infected with the COVID-19 bacteria at Alfortville national veterinary school in Maison-Alfort, near Paris, during the outbreak of the coronavirus disease (COVID-19) in France, May 19, 2020. Picture taken May 19, 2020. REUTERS/Benoit Tessier 

A dog is taught to find a piece of fabric infected with the COVID-19 bacteria at Alfortville national veterinary school in Maison-Alfort, near Paris, during the outbreak of the coronavirus disease (COVID-19) in France, May 19, 2020. Picture taken May 19, 2020. REUTERS/Benoit Tessier 

A man teaches his dog to find a piece of fabric that was infected with the COVID-19 bacteria during a training session at Alfortville national veterinary school in Maison-Alfort, near Paris, during the outbreak of the coronavirus disease (COVID-19) in France, May 19, 2020. Picture taken May 19, 2020. REUTERS/Benoit Tessier 

The logo of Cyno Pro Detection Dog is pictured during a training session with fabric infected with the COVID-19 bacteria at Alfortville national veterinary school in Maison-Alfort, near Paris, during the outbreak of the coronavirus disease (COVID-19) in France, May 19, 2020. Picture taken May 19, 2020. REUTERS/Benoit Tessier 

A man demonstrates how to spray MAP-1, an antimicrobial coating that a team of university researchers claimed to be effective in killing virus, bacteria and spore, at a bedspace apartment in Hong Kong, China April 21, 2020. Picture taken April 21, 2020. REUTERS/Yoyo Chow 

A telephone station is filled with rubber gloves, hand sanitizer, and anti-bacteria wipes outside of the Senate Subway, ahead of a vote on the coronavirus relief bill on Capitol Hill in Washington, U.S., March 25, 2020. REUTERS/Tom Brenner 

Johanna Mendoza, 36, holds her 18-month-old daughter Johanny, who is recovering from malnutrition, while waiting to be checked at the non-profit organization Mapani in Barquisimeto, Venezuela, August 7, 2019. "The doctor told me that my girl was malnourished, and she also had a serious bacterial infection, that if she didn't receive treatment in time, she could die," Mendoza said. She also mentioned that they visited a public hospital several times and Johanny was never correctly diagnosed, "They only checked her and said she had a bacteria in her mouth." Mapani is a nutrition-focused non-profit organisation. REUTERS/Carlos Garcia Rawlins SEARCH "VENEZUELA MALNUTRITION" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. 

Two-day-old goslings are seen before being fed with a dose of serum containing the bacteria to stimulate fat growth in liver to produce a "naturally fatty" foie gras, in Bazillac, France, December 3, 2019. Picture taken December 3, 2019. REUTERS/Regis Duvignau 

A geese grower farmer holds a two-day-old gosling before being fed with a dose of serum containing the bacteria to stimulate fat growth in liver to produce a "naturally fatty" foie gras, in Bazillac, France, December 3, 2019. Picture taken December 3, 2019. REUTERS/Regis Duvignau 

A geese grower farmer holds a pipette with a dose of serum containing the bacteria to stimulate fat growth in liver to a two-day-old goslings to produce a "naturally fatty" foie gras, in Bazillac, France, December 3, 2019. Picture taken December 3, 2019. REUTERS/Regis Duvignau 

A geese grower farmer gives a dose of serum containing the bacteria to stimulate fat growth in liver to a two-day-old gosling to produce a "naturally fatty" foie gras, in Bazillac, France, December 3, 2019. Picture taken December 3, 2019. REUTERS/Regis Duvignau 

A geese grower farmer gives a dose of serum containing the bacteria to stimulate fat growth in liver to a two-day-old gosling to produce a "naturally fatty" foie gras, in Bazillac, France, December 3, 2019. Picture taken December 3, 2019. REUTERS/Regis Duvignau 

A geese grower farmer gives a dose of serum containing the bacteria to stimulate fat growth in liver to a two-day-old gosling to produce a "naturally fatty" foie gras, in Bazillac, France, December 3, 2019. Picture taken December 3, 2019. REUTERS/Regis Duvignau 

French scientist Remy Burcelin, who discovered the process to produce "naturally-fat" foie gras, checks samples of intestinal bacteria culture to make serum which is introduced to baby geese to stimulate fat growth in liver, as he works in his research laboratory in Labege, France, December 2, 2019. Picture taken December 2, 2019. REUTERS/Regis Duvignau 

French scientist Remy Burcelin, who discovered the process to produce "naturally-fat" foie gras, looks at samples of intestinal bacteria culture to make serum which is introduced to baby geese to stimulate fat growth in liver, as he works in his research laboratory in Labege, France, December 2, 2019. Picture taken December 2, 2019. REUTERS/Regis Duvignau 

French scientist Remy Burcelin, who discovered the process to produce "naturally-fat" foie gras, checks samples of intestinal bacteria culture to make serum which is introduced to baby geese to stimulate fat growth in liver, as he works in his research laboratory in Labege, France, December 2, 2019. Picture taken December 2, 2019. REUTERS/Regis Duvignau 

A dish with a "naturally fatty" foie gras, produced without gavage made from geese fed with bacteria to stimulate the fattening of the liver, avoiding force-feeding geese that is criticized by animal welfare activists, is seen at "Solides" restaurant in Toulouse, France, November 29, 2019. Picture taken November 29, 2019. REUTERS/Regis Duvignau 

French scientist Remy Burcelin, who discovered the process to produce "naturally-fat" foie gras, checks samples of intestinal bacteria culture to make serum which is introduced to baby geese to stimulate fat growth in liver, as he works in his research laboratory in Labege, France, December 2, 2019. Picture taken December 2, 2019. REUTERS/Regis Duvignau 

Simon Carlier, Chef of "Solides" restaurant, prepares a dish with a "naturally fatty" foie gras, produced without gavage made from geese fed with bacteria to stimulate the fattening of the liver, avoiding force-feeding geese that is criticized by animal welfare activists, at a restaurant in Toulouse, France, November 29, 2019. Picture taken November 29, 2019. REUTERS/Regis Duvignau 

Simon Carlier, Chef of "Solides" restaurant, smells a "naturally fatty" foie gras, produced without gavage made from geese fed with bacteria to stimulate the fattening of the liver, avoiding force-feeding geese that is criticized by animal welfare activists, at a restaurant in Toulouse, France, November 29, 2019. Picture taken November 29, 2019. REUTERS/Regis Duvignau 

Simon Carlier, Chef of "Solides" restaurant, prepares a dish with a "naturally fatty" foie gras, produced without gavage made from geese fed with bacteria to stimulate the fattening of the liver, avoiding force-feeding geese that is criticized by animal welfare activists, at a restaurant in Toulouse, France, November 29, 2019. Picture taken November 29, 2019. REUTERS/Regis Duvignau 

A "naturally fatty" foie gras, produced without gavage made from geese fed with bacteria to stimulate the fattening of the liver, avoiding force-feeding geese that is criticized by animal welfare activists, is pictured in a restaurant in Toulouse, France, November 29, 2019. Picture taken November 29, 2019. REUTERS/Regis Duvignau 

A "naturally fatty" foie gras, produced without gavage made from geese fed with bacteria to stimulate the fattening of the liver, avoiding force-feeding geese that is criticized by animal welfare activists, is pictured in a restaurant in Toulouse, France, November 29, 2019. Picture taken November 29, 2019. REUTERS/Regis Duvignau 

Simon Carlier, Chef of "Solides" restaurant, cuts a "naturally fatty" foie gras, produced without gavage made from geese fed with bacteria to stimulate the fattening of the liver, avoiding force-feeding geese that is criticized by animal welfare activists, at a restaurant in Toulouse, France, November 29, 2019. Picture taken November 29, 2019. REUTERS/Regis Duvignau 

A "naturally fatty" foie gras, produced without gavage made from geese fed with bacteria to stimulate the fattening of the liver, avoiding force-feeding geese that is criticized by animal welfare activists, is pictured in a restaurant in Toulouse, France, November 29, 2019. Picture taken November 29, 2019. REUTERS/Regis Duvignau