A municipal worker clears off hyacinth weed at the Grootvaly Blesbokspruit wetland reserve, near Springs, in the east of Johannesburg, in South Africa, February 15, 2023. REUTERS/Siphiwe Sibeko 

Water hyacinth eating bugs called Megamelus scutellaris are displayed inside a vacuum at the Grootvaly Blesbokspruit wetland reserve, near Springs, in the east of Johannesburg, South Africa, February 15, 2023. REUTERS/Siphiwe Sibeko 

Municipal workers take a break as they clear off hyacinth weed at the Grootvaly Blesbokspruit wetland reserve, near Springs, in the east of Johannesburg, in South Africa, February 15, 2023. REUTERS/Siphiwe Sibeko 

People use boats to transport floating beds to a floating farm through the Belua river in Pirojpur district, Bangladesh, August 18, 2022. Many farmers in the southwestern part of Bangladesh plant crop seedlings and grow vegetables on the floating rafts made from invasive water hyacinths during monsoon seasons when dry land is scarce to ensure food security as the low-lying country has been experiencing prolonged floods and water-logging because of the changing climate in recent times. REUTERS/Mohammad Ponir Hossain SEARCH "HOSSAIN FLOATING FARMS" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. 

A man holds a rope as people transport floating beds towards a farm through the Belua river in Pirojpur district, Bangladesh, August 18, 2022. Many farmers in the southwestern part of Bangladesh plant crop seedlings and grow vegetables on the floating rafts made from invasive water hyacinths during monsoon seasons when dry land is scarce to ensure food security as the low-lying country has been experiencing prolonged floods and water-logging because of the changing climate in recent times. REUTERS/Mohammad Ponir Hossain SEARCH "HOSSAIN FLOATING FARMS" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. 

A farmer places water weeds on top of the seedlings' root on a floating bed, at his farm in Pirojpur district, Bangladesh, August 16, 2022. Many farmers in the southwestern part of Bangladesh plant crop seedlings and grow vegetables on the floating rafts made from invasive water hyacinths during monsoon seasons when dry land is scarce to ensure food security as the low-lying country has been experiencing prolonged floods and water-logging because of the changing climate in recent times. REUTERS/Mohammad Ponir Hossain SEARCH "HOSSAIN FLOATING FARMS" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. 

Farmers work at a floating farm where they grow vegetable seedlings during monsoon season in Pirojpur district, Bangladesh, August 16, 2022. Many farmers in the southwestern part of Bangladesh plant crop seedlings and grow vegetables on the floating rafts made from invasive water hyacinths during monsoon seasons when dry land is scarce to ensure food security as the low-lying country has been experiencing prolonged floods and water-logging because of the changing climate in recent times. REUTERS/Mohammad Ponir Hossain SEARCH "HOSSAIN FLOATING FARMS" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. 

A farmer irrigates his floating bed, at his farm in Pirojpur district, Bangladesh, August 16, 2022. Many farmers in the southwestern part of Bangladesh plant crop seedlings and grow vegetables on the floating rafts made from invasive water hyacinths during monsoon seasons when dry land is scarce to ensure food security as the low-lying country has been experiencing prolonged floods and water-logging because of the changing climate in recent times. REUTERS/Mohammad Ponir Hossain SEARCH "HOSSAIN FLOATING FARMS" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. TPX IMAGES OF THE DAY 

Farmers work at a floating farm where they grow vegetable seedlings during monsoon season in Pirojpur district, Bangladesh, August 15, 2022. Many farmers in southwestern part of Bangladesh plant crop seedlings and grow vegetables on the floating rafts made from invasive water hyacinths during monsoon seasons when dry land is scarce to ensure food security as the low-lying country has been experiencing prolonged floods and waterlogging because of the changing climate in recent times. REUTERS/Mohammad Ponir Hossain SEARCH "HOSSAIN FLOATING FARMS" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. 

Farmer Mohammad Mostafa, 42, places water weeds on top of the seedlings' root, at his floating farm in Nazirpur, Pirojpur district, Bangladesh, August 15, 2022. Many farmers in the southwestern part of Bangladesh plant crop seedlings and grow vegetables on the floating rafts made from invasive water hyacinths during monsoon seasons when dry land is scarce to ensure food security as the low-lying country has been experiencing prolonged floods and water-logging because of the changing climate in recent times. "My father and forefathers all used to do this. But the work is very hard," said Mostafa. "I tried my luck at floating farming five years ago and that made a great difference to my life." REUTERS/Mohammad Ponir Hossain SEARCH "HOSSAIN FLOATING FARMS" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. 

Beijing 2022 Winter Paralympic Games - Para Alpine Skiing - Men's Super Combined Vision Impaired - National Alpine Skiing Centre, Yanqing district, Beijing, China - March 7, 2022. Hyacinthe Deleplace of France in action. REUTERS/Gonzalo Fuentes 

Beijing 2022 Winter Paralympic Games - Para Alpine Skiing - Men's Super Combined Vision Impaired - National Alpine Skiing Centre, Yanqing district, Beijing, China - March 7, 2022. Hyacinthe Deleplace of France in action. REUTERS/Aly Song 

A worker carries buckets of shredded water hyacinth to be converted into biogas, near the town of Kisumu, Kenya June 9, 2021. Picture taken June 9, 2021. REUTERS/Baz Ratner 

A worker uncovers a bag used to converted water hyacinth into biogas, near the town of Kisumu, Kenya June 9, 2021. Picture taken June 9, 2021. REUTERS/Baz Ratner 

A worker fills a bag used to converted water hyacinth into biogas, near the town of Kisumu, Kenya June 9, 2021. Picture taken June 9, 2021. REUTERS/Baz Ratner 

A worker shreds water hyacinth to be converted into biogas, near the town of Kisumu, Kenya June 9, 2021. Picture taken June 9, 2021. REUTERS/Baz Ratner 

Entrepreneur Dominic Kahumbu and his team use a boat to harvest water hyacinth to be converted into biogas, on Lake Victoria, near the town of Kisumu, Kenya June 9, 2021. Picture taken with a drone June 9, 2021. REUTERS/Baz Ratner 

A worker shreds water hyacinth to be converted into biogas, near the town of Kisumu, Kenya June 9, 2021. Picture taken June 9, 2021. REUTERS/Baz Ratner 

Tony Otieno lights a flame on a cooker that uses biogas made from converted water hyacinth harvested from Lake Victoria, at his grandmother's house near the town of Kisumu, Kenya June 9, 2021. Picture taken June 9, 2021. REUTERS/Baz Ratner 

Workers uncover a bag used to converted water hyacinth into biogas, near the town of Kisumu, Kenya June 9, 2021. Picture taken June 9, 2021. REUTERS/Baz Ratner 

A flame burns on a cooker that uses biogas made from water hyacinth harvested from Lake Victoria, near the town of Kisumu, Kenya June 9, 2021. Picture taken June 9, 2021. REUTERS/Baz Ratner 

Entrepreneur Dominic Kahumbu and his team use a boat to harvest water hyacinth to be converted into biogas, on Lake Victoria, near the town of Kisumu, Kenya June 9, 2021. Picture taken with a drone June 9, 2021. REUTERS/Baz Ratner 

Entrepreneur Dominic Kahumbu and his worker use a boat to harvest water hyacinth to be converted into biogas, on Lake Victoria, near the town of Kisumu, Kenya June 9, 2021. Picture taken June 9, 2021. REUTERS/Baz Ratner 

Entrepreneur Dominic Kahumbu and his worker use a boat to harvest water hyacinth to be converted into biogas, on Lake Victoria, near the town of Kisumu, Kenya June 9, 2021. Picture taken June 9, 2021. REUTERS/Baz Ratner 

Entrepreneur Dominic Kahumbu and his team return to port after harvesting water hyacinth to be converted into biogas, on Lake Victoria, near the town of Kisumu, Kenya June 9, 2021. Picture taken June 9, 2021. REUTERS/Baz Ratner 

A man carries a thermocol box on his shoulders while walking amidst water hyacinths in the Yamuna river on Earth Day, during a lockdown to slow spreading of the coronavirus disease (COVID-19), in New Delhi, India, April 22, 2020. REUTERS/Anushree Fadnavis 

Cleaners clear water hyacinths, a rapidly growing floating plant, to protect the water environment in a canal in Nonthaburi province, on the outskirts of Bangkok, Thailand, June 8, 2017. REUTERS/Chaiwat Subprasom 

Cleaners clear water hyacinths, a rapidly growing floating plant, to protect the water environment in a canal in Nonthaburi province, on the outskirts of Bangkok, Thailand, June 8, 2017. REUTERS/Chaiwat Subprasom 

Cleaners clear water hyacinths, a rapidly growing floating plant, to protect the water environment in a canal in Nonthaburi province, on the outskirts of Bangkok, Thailand, June 8, 2017. REUTERS/Chaiwat Subprasom 

Cleaners clear water hyacinths, a rapidly growing floating plant, to protect the water environment in a canal in Nonthaburi province, on the outskirts of Bangkok, Thailand, June 8, 2017. REUTERS/Chaiwat Subprasom 

A boat rests on a bed of water hyacinth choking the port of the city of Kisumu, Kenya April 19, 2017. Picture taken April 19, 2017 . REUTERS/Baz Ratner 

A house is seen partially submerged and surrounded by water hyacinth at the edge of the Lagos Lagoon October 28, 2014. REUTERS/Akintunde Akinleye (NIGERIA - Tags: SOCIETY) 

Workers use rakes to scoop out water hyacinths blocking a portion of Laguna de Bay in Taguig City, Metro Manila March 22, 2013. World Water Day falls on March 22. REUTERS/Cheryl Ravelo (PHILIPPINES - Tags: ENVIRONMENT SOCIETY) 

A boatman struggles to move his boat, loaded with passengers, through water hyacinth in a dead part of river Buriganga in Dhaka August 30, 2012. REUTERS/Andrew Biraj (BANGLADESH - Tags: TRANSPORT ENVIRONMENT SOCIETY) 

A boatman struggles to move his boat, full of passengers, through water hyacinth in a dead part of river Buriganga in Dhaka August 30, 2012. REUTERS/Andrew Biraj (BANGLADESH - Tags: SOCIETY TRANSPORT ENVIRONMENT) 

Boats full of passengers struggle to move through water hyacinth in a dead part of river Buriganga in Dhaka August 30, 2012. REUTERS/Andrew Biraj (BANGLADESH - Tags: TRANSPORT SOCIETY) 

Boats full of passengers struggle to move through water hyacinth in a dead part of river Buriganga in Dhaka August 30, 2012. REUTERS/Andrew Biraj (BANGLADESH - Tags: TRANSPORT TPX IMAGES OF THE DAY SOCIETY) 

Candidates for the Miss Water Lily pageant walk in their gowns, made from dried water lily stalks, during the Water Lily Festival in Las Pinas city, south of Manila July 19, 2012. The festival aims to promote the water hyacinth-based livelihood enterprise. Residents harvest water hyacinths and dry the stalks, which become raw material for producing baskets, trays, slippers and other functional and ornamental items. REUTERS/Romeo Ranoco (PHILIPPINES - Tags: SOCIETY ENVIRONMENT) 

A worker makes a jar basket with dried water lily stalks, during the Water Lily Festival in Las Pinas city, south of Manila July 19, 2012. The Water Lily festival aims to promote the water hyacinth-based livelihood enterprise. Residents harvest water hyacinths and dry the stalks, which become raw material for producing baskets, trays, slippers and other functional and ornamental items. REUTERS/Romeo Ranoco (PHILIPPINES - Tags: SOCIETY ENVIRONMENT) 

A makeup artist applies makeup on a candidate for the Miss Water Lily in her gown, made from dried water lily stalks, during the Water Lily Festival in Las Pinas city, south of Manila July 19, 2012. The water Lily festival aims to promote the water hyacinth-based livelihood enterprise. Residents harvest water hyacinths and dry the stalks, which become raw material for producing baskets, trays, slippers and other functional and ornamental items. REUTERS/Romeo Ranoco (PHILIPPINES - Tags: SOCIETY ENVIRONMENT) 

Candidates for the Miss Water Lily pageant pose in their gowns, made from dried water lily stalks, during the Water Lily Festival in Las Pinas city, south of Manila July 19, 2012. The water Lily festival aims to promote the water hyacinth-based livelihood enterprise. Residents harvest water hyacinths and dry the stalks, which become raw material for producing baskets, trays, slippers and other functional and ornamental items. REUTERS/Romeo Ranoco (PHILIPPINES - Tags: SOCIETY ENVIRONMENT) 

Candidates for the Miss Water Lily pageant pose in their gowns, made from dried water lily stalks, during the Water Lily Festival in Las Pinas city, south of Manila July 19, 2012. The water Lily festival aims to promote the water hyacinth-based livelihood enterprise. Residents harvest water hyacinths and dry the stalks, which become raw material for producing baskets, trays, slippers and other functional and ornamental items. REUTERS/Romeo Ranoco (PHILIPPINES - Tags: SOCIETY ENVIRONMENT) 

Candidates for the Miss Water Lily pageant pose in their gowns, made from dried water lily stalks, during the Water Lily Festival in Las Pinas city, south of Manila July 19, 2012. The water Lily festival aims to promote the water hyacinth-based livelihood enterprise. Residents harvest water hyacinths and dry the stalks, which become raw material for producing baskets, trays, slippers and other functional and ornamental items. REUTERS/Romeo Ranoco (PHILIPPINES - Tags: SOCIETY ENVIRONMENT) 

An abandoned canoe is seen on a water hyacinth covered lagoon, near the Makoko slum, in Nigeria's commercial capital Lagos October 26, 2011.Rapidly growing megacities in Africa and Asia face the highest risks from rising sea levels, floods and other climate change impacts, says a global survey aimed at guiding city planners and investors.REUTERS/Akintunde Akinleye (NIGERIA - Tags: ENVIRONMENT SOCIETY) 

Men paddle canoes filled with sand through water hyacinth floating on the Lagos Lagoon October 26, 2011. Rapidly growing megacities in Africa and Asia face the highest risks from rising sea levels, floods and other climate change impacts, says a global survey aimed at guiding city planners and investors. REUTERS/Akintunde Akinleye (NIGERIA - Tags: ENVIRONMENT SOCIETY) 

Men paddle canoes filled with sand through water hyacinth floating on the Lagos Lagoon October 26, 2011. Rapidly growing megacities in Africa and Asia face the highest risks from rising sea levels, floods and other climate change impacts, says a global survey aimed at guiding city planners and investors. REUTERS/Akintunde Akinleye (NIGERIA - Tags: ENVIRONMENT SOCIETY) 

The casket of the late Nobel peace laureate and environmentalist Wangari Maathai, which is made from water hyacinth, papyrus reeds and a bamboo frame and wrapped in the Kenyan national flag, is seen inside a hearse at the Kariakor crematorium in Nairobi October 8, 2011. Thousands of Kenyans paid their respects to Maathai, the first African woman to win the peace prize in 2004 for her battle to defend women's rights and protect the country's environment, on Saturday at a state funeral held in a park where she had once been beaten up for holding a protest. REUTERS/Thomas Mukoya (KENYA - Tags: OBITUARY) 

A scavenger paddles his makeshift raft amidst rotten water hyacinth and garbage, while gathering recyclable materials in Manila Bay August 7, 2011. According to a poll released in July conducted by the Social Weather Stations (SWS), the proportion of the population who rated themselves as "poor", fell slightly from 51 percent (10.4 million families) in March to 49 percent, or approximately 9.8 million families. REUTERS/Erik de Castro (PHILIPPINES - Tags: ENVIRONMENT SOCIETY IMAGES OF THE DAY) 

A scavenger wades through water hyacinth in the waters of Manila Bay while searching for recyclable materials to sell July 14, 2011. REUTERS/Romeo Ranoco (PHILIPPINES - Tags: ENVIRONMENT) 

A government worker uses a rake to clear water hyacinth covering the shore of Manila Bay July 14, 2011.
REUTERS/Romeo Ranoco (PHILIPPINES - Tags: ENVIRONMENT) 

A scavenger wades through water hyacinth in the waters of Manila Bay while searching for recyclable materials to sell July 14, 2011.
REUTERS/Romeo Ranoco (PHILIPPINES - Tags: ENVIRONMENT) 

A fisherman wades through water hyacinths in Laguna de Bay in Muntinlupa, Metro Manila August 20, 2010. REUTERS/Erik de Castro (PHILIPPINES - Tags: ENVIRONMENT EMPLOYMENT BUSINESS IMAGES OF THE DAY) 

A worker clears water hyacinths in Yaojiang River in Ningbo, Zhejiang province November 25, 2009. World leaders will meet in Copenhagen in December to try and agree a new deal to fight climate change. Picture taken November 25, 2009. REUTERS/Steven Shi (CHINA ENVIRONMENT SOCIETY) 

Caimans rest on bank in Brazil's Pantanal wetland near the city of Corumba, January 14, 2009. Jaguars still roam the world's largest wetland and endangered Hyacinth Macaws nest in its trees but advancing farms and industries are destroying Brazil's Pantanal region at an alarming rate. Picture taken on January 14. TO MATCH FEATURE BRAZIL-PANTANAL/ REUTERS/Jamil Bittar (BRAZIL) 

Workers sort wood floating in the water hyacinth clogged Lagos lagoon in Nigeria's commercial capital Lagos, October 22, 2007. Economic growth in sub-Saharan Africa is seen quickening in 2007 and next year, but weak policies and risks of conflict and political instability would weigh heavily on some countries, an International Monetary Fund report said. REUTERS/Akintunde Akinleye (NIGERIA) 

Residents of Kamrangichar travel across the river Buriganga, covered with water hyacinths, on boats in Dhaka July 27, 2007. Floods caused by incessant rains in India over the past week have displaced hundreds of thousands of people in the east and northeast, destroyed crops and damaged bridges, officials said on Friday. REUTERS/Rafiqur Rahman (BANGLADESH) 

A boat struggles to move through water hyacinth in the river Buriganga in Dhaka June 26, 2007. REUTERS/Rafiqur Rahman (BANGLADESH) 

Villagers unload logs from a canoe surrounded by clusters of water hyacinth in Ojo, near Lagos, in south west Nigeria November 9, 2006. Some 189 nations are meeting in Kenya to explore options for a global deal to combat climate change, with most focusing on cutting the amount of carbon dioxide pumped into the air by industry and modern lifestyles. REUTERS/George Esiri (NIGERIA) 

Villagers return home in a canoe passing through clusters of water hyacinth in Ojo, near Lagos, in south west Nigeria November 9, 2006. Some 189 nations are meeting in Kenya to explore options for a global deal to combat climate change, with most focusing on cutting the amount of carbon dioxide pumped into the air by industry and modern lifestyles. REUTERS/George Esiri (NIGERIA) 

Fishermen paddle their canoe through clusters of water hyacinth in Ojo, near Lagos, in southwest Nigeria November 9, 2006. Some 189 nations are meeting in Kenya to explore options for a global deal to combat climate change, with most focusing on cutting the amount of carbon dioxide pumped into the air by industry and modern lifestyles. REUTERS/George Esiri (NIGERIA)