Vanishing Wisdom of the Sundarbans–How climate change erodes centuries of ecological knowledge

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Climate Change

Bapi Mondal and his wife Shanti in Bangalore. Climate change has forced the couple from their traditional livelihoods in the Sundarbans. Credit: Diwash Gahatraj/IPS

Bapi Mondal and his wife Shanti in Bangalore. Climate change has forced the couple from their traditional livelihoods in the Sundarbans. Credit: Diwash Gahatraj/IPS

BANGALORE & PAKHIRALAY, India, Oct 15 2025 (IPS) – Bapi Mondal’s morning routine in Bangalore is a world away from his ancestral village, Pakhiralay, in the Sundarbans, West Bengal. He wakes before dawn, navigates heavy traffic, and spends eight long hours molding plastic battery casings. It’s not the life his honey-gathering forefathers knew, but factors like extreme storms, rising seas, and deadly soil salinity forced the 40-year-old to abandon centuries of family tradition and travel miles away to work in a concrete suburban factory.


Bapi still remembers his traditional skills—walking through a mangrove forest to find a tree with a honeycomb, mending boats and fishing nets, and singing and acting in the traditional plays. His 19-year-old son, Subhodeep—working alongside in the factory—has lost the heritage.

Bapi’s home, the Sundarbans—the world’s largest mangrove forest—is on the frontlines of climate change, and local livelihoods are taking the hit. In this watery maze where land and sea meet, villagers who once relied on fishing, honey collection and farming are now grappling with rising tides, saltier water, and more frequent storms. For many, life is becoming a struggle to hold on to centuries-old ways.

Sea levels in the Sundarbans are rising nearly twice the global rate, flooding villages and forcing families out. Saltwater ruins rice fields and ponds, making farming and fishing harder. Mawalis, the honey gatherers, also struggle as climate change disrupts flowering and damages mangroves, reducing wild bee populations.

A fisherman in Sundarbans. Credit: Diwash Gahatraj/IPS

A fisherman in the Sundarbans. Credit: Diwash Gahatraj/IPS

The crisis doesn’t end with the water. Salinity, once held at bay by freshwater flows, is climbing year after year, disrupting both fishing and farming. Pollution, ill-managed embankments, and overexploitation of resources add to the challenge. As incomes shrink and lands disappear, thousands leave for nearby cities, hoping for work but often finding only life in urban slums.

City life is unforgiving for migrants like Mondal. He spends eight grueling hours on his feet, molding battery casings six days a week in harsh factory conditions. At the end of each day, he returns to a small one-room apartment. He shares this space with his wife Shanti and son, Subhodeep. The family struggles financially. Bapi earns ₹19,000 per month (about USD 215)—barely enough to get by. Despite the hardships, he says the work is still his choice.

“A hard choice, but a choice,” he explains.

Morning rush is hectic for the Mondal family. He points to the wall clock and asks his wife to pack lunch quickly. “All three of us work in different factories in the area,” Mondal says. “We all have to reach work by 8 am.”

Gopal Mondal and his family in the Sundarbans. Credit: Diwash Gahatraj/IPS

Gopal Mondal and his family in the Sundarbans. Gopal still ventures into the forests to collect wild honey. Credit: Diwash Gahatraj/IPS

Shanti, Bapi’s wife, spends her days at a garment factory pressing clothes with a hot iron. She works eight-hour shifts with just one weekly break, earning ₹15,000 per month (about USD 169). Their 19-year-old son, Subhodeep, has also joined his father at the plastic factory. All three now work in Bommasandra, Bangalore’s industrial belt, pooling their wages to survive.

The migration has split their family apart.

“We have an 11-year-old daughter who lives with my in-laws in the Sundarbans,” Shanti explains. The cost of city life forced them to leave their youngest child behind. “It breaks my heart to be apart from my daughter, but we want her to have a good education and life—that’s why we sacrifice,” says Shanti. Her daughter attends school back in the village.

Her job gave her economic independence and a voice in family decisions, like building their new house. Bapi’s family, rooted in the village for centuries, were Mawalis, honey gatherers who knew the forest through knowledge passed down generations.

Still Rooted

Bapi’s father, Gopal Mondal, still ventures into the dangerous forests of Sunderbans. He risks tiger attacks and deadly cyclones to collect wild honey. But the forest that once fed families is now failing them.

Climate change has disrupted everything. Cyclones strike more often and with greater force. The natural flowering cycle has gone haywire. Fish populations in the waters have crashed.

“The honey harvest keeps shrinking and prices keep falling,” Gopal explains.

As Gopal tried to hold on to tradition, his son Bapi could no longer see a future in the same waters and forests.

“The forest no longer provides enough honey or fish,” Bapi shares. The rhythms his ancestors lived by for centuries suddenly made no sense. Faced with shrinking opportunities, Bapi tried other work back home. Besides going to the jungle for honey with his father during the season (April-May), he operated a van gaari—a battery-powered three-wheeler with a wooden platform for passengers. But even that barely paid enough to survive. “There was a time when I struggled to buy a saree for my wife,” he recalls. Migration was the only choice left.

A boat ferries passengers in Sundarbans. Credit: Diwash Gahatraj/IPS

A boat ferries passengers in Sundarbans. Credit: Diwash Gahatraj/IPS

From Forests to Factories

Apart from forced migration, climate change erodes memory, identity, and ancestral knowledge. Leaving the Sundarbans has cost the family more than a homeland.

Bapi still carries traditional skills—navigating treacherous waters by boat and collecting honey deep in the forest.

“I know how to catch shrimp and crabs from the river and sea,” he says. “My father and uncles taught me these skills when I was young.”

His wife, Shanti, nods, adding that she was an expert crab and shrimp collector back in the Sundarbans. “I think I still have it in me,” she says with quiet pride.

But the chain of knowledge is breaking. “I could not pass on that wisdom to my son,” Bapi admits with regret.

Subhodeep represents this lost generation. He finished tenth grade and left his village to join his parents in Bangalore. He has not learned the skills that defined his family for generations. “I have never entered the forest to collect honey or fish back in the village,” Subhodeep explains. “My parents were against it.”

Bon bibi temple in Pakhiralay village. Along with losing traditional livelihoods, religion and cultural life are also in jeopardy. Credit: Diwash Gahatraj/IPS

Bon bibi temple in Pakhiralay village. Along with losing traditional livelihoods, religion and cultural life are also in jeopardy. Credit: Diwash Gahatraj/IPS

The irony is stark. Bapi’s parents encouraged him to learn these ancestral skills. But when environmental collapse made these traditions dangerous and unprofitable, Bapi chose to shield his son from them.

For the Mondals, the forest has become too dangerous and unreliable.

“Going to collect honey or catch fish is very unpredictable now,” Bapi explains. Catch volumes have fallen, and tiger attacks have grown. Bapi’s family knows the risk; his grandfather was killed while gathering honey in the forest.

Years earlier, a tiger also attacked Gopal Mondal. He was luckier—he escaped alive but still carries scars on his hand.

These brutal realities shaped Bapi’s decision about his son’s future. “I don’t want my next generation to have such a risky occupation,” he says. The choice is clear. Families can either cling to dangerous traditions that no longer pay enough to survive or abandon their ancestral practices for safer work in distant cities.

Are there other reasons behind the changes in the Sundarbans?

“We can’t just blame climate change and ignore human activities making things worse,” says Professor Tuhin Ghosh of Jadavpur University’s School of Oceanographic Studies. Human activity and climate change create a deadly combination.

People cleared mangroves for farms and fish ponds and built embankments that blocked tidal flows. The result is salt contamination, poisoned soil and water, vanishing species, and a broken landscape.

Uninhabitable Home

About 4.5 million people live across the Sundarbans region in Bangladesh and India. A recent survey reveals the massive scale of climate migration: nearly 59% of households have at least one family member who has moved away for work.

Some studies report 60,000 people migrated from parts of the Sundarbans by 2018. But household surveys show much higher rates because they measure affected families, not just individuals.

These local figures reflect a much bigger crisis. Across Bangladesh, weather-related disasters displaced 7.1 million people in 2022 alone, showing how climate change drives mass movement.

On the Indian side in West Bengal, researchers document large seasonal and permanent migration flows to cities and other states. Families routinely send members to work elsewhere, though official counts are scarce.

Loss Beyond Dollars

Over the past two decades, the Sundarbans has been hit by cyclones made stronger by climate change. They uprooted thousands and caused millions in losses. But beyond disaster relief and migration, a quieter crisis unfolds: the erosion of centuries-old ecological wisdom, culture, and tradition.

Gopal Mondal, in his early sixties, sits outside his modest home in Pakhiralay. When asked about protective equipment for his dangerous work collecting honey in the Sundarbans forest, he holds up a small amulet—a tabeej.

“This and my prayers to Bon Bibi are my protection,” says Mondal, who leads a team of honey collectors into the mangrove forests. “They shield us from storms and babu (tigers).”

The elderly collector recites mantras passed down through generations—teachings from his father or cousins, though he cannot recall exactly who taught him.

“The whole community worships Bon Bibi,” he explains simply

For Sundarbans communities like Mondal’s, Bon Bibi—the “Lady of the Forest”—is a guardian of the mangroves. For centuries, fishermen, honey collectors, and wood gatherers have sought her protection in tiger territory and cyclone-prone waters. Her worship is more than faith; it reflects the people’s bond with a dangerous yet life-sustaining environment, offering both comfort and identity where safety tools are scarce.

When asked about traditional knowledge slipping away from his family, Mondal’s weathered face shows a faint smile.

“Earlier, every fisherman’s family had someone —a son or grandson—who knew how to repair torn nets or mend boats,” he explains. “But in my family, things are slowly changing. My grandsons and sons live too far away, and their visits home are too short to learn these skills.”

The honey collector pauses, watching the distant mangroves. “The younger generation shows very little interest in our profession,” he adds quietly.

Climate migration expert M. Zakir Hossain Khan of Change Initiative, a Bangladesh-based think tank focused on solving critical global challenges, warns that climate-driven displacement from the Sundarbans is destroying centuries-old ways of life that depend entirely on deep knowledge of the forest and rivers.

Fishermen carry rare knowledge of tides, breeding cycles, and mangrove routes, passed down through years of practice. With youth leaving for city jobs, few inherit it. Honey gatherers know how to find hives, protect bees, and survive in tiger territory. As young people turn away, honey collection is fading from the Sundarbans.

A Vanishing Heritage

This generational shift reflects a broader transformation across the Sundarbans. Traditional skills that once defined coastal communities—net weaving, boat building, reading weather patterns, and forest navigation—are disappearing as young people migrate to cities primarily  for employment and a few for education.

“Similarly, mangrove-based handicrafts and boat-making using leaves, bamboo, and mangrove wood to make mats, roofing materials, and small boats demand both ecological understanding and artisanal skill, which are now rarely passed down,” comments Khan from Change Initiative.

He adds that herbal medicine and spiritual rituals practiced by local healers using plants like sundari bark and hental are also at risk, as migration and urbanization erode the cultural setting that sustains them.

Culture at Crossroads

Ghosh, who has spent over 30 years working in the Sundarbans, points to a troubling pattern.

“Migration is killing our folk arts,” he says. “Bonbibi stories, jatra pala theater, fishermen’s songs—they’re all disappearing. The people who used to perform during festivals are getting old. And there’s no one to replace them.”

The Sundarbans face a cultural crisis. Traditional performances that once brought villages together during religious festivals now struggle to find performers. Young people who might have learned these arts from their elders are instead leaving for cities for a better life

Once central to life in the Sundarbans, folk traditions like Jatra Pala, Bonbibi tales, and fishermen’s songs now fade with their aging performers. With few young apprentices, a rich cultural heritage risks disappearing—leaving behind a region not just economically changed, but culturally empty.

Note: This story was produced with support from Internews’ Earth Journalism Network

IPS UN Bureau Report

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Cuba’s Coastal Dwellers Mitigate the Effects of Climate Change

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Climate Action

When the weather is bad, the residents of the Litoral neighborhood in Manzanillo, Cuba, are forced to evacuate their houses. When it’s calm, the sea penetrates the foundations of houses, leaving them vulnerable. Now the community is getting together to restore the mangroves and improve the environment to return their homes to safety.

A fisherman sits next to several boats at the GeoCuba Local Interest Fishing Port in the bay of Manzanillo, in the eastern Cuban province of Granma. Credit: Jorge Luis Baños / IPS

A fisherman sits next to several boats at the GeoCuba Local Interest Fishing Port in the bay of Manzanillo, in the eastern Cuban province of Granma. Credit: Jorge Luis Baños / IPS

MANZANILLO, Cuba, Oct 2 2024 (IPS) – Every time a hurricane clouds the skies over the city of Manzanillo, in the eastern Cuban province of Granma, the sea pounds the Litoral neighbourhood, forcing many of the 200 families who live there to evacuate inland because of flooding.


When the weather is calm, the sea penetrates subtly and constantly, salinizing the water table and eroding the coast, affecting the foundations of houses and artesian wells.

“The water almost always enters this area. The houses were built too close to the sea and the mangroves are deforested,” community leader Martha Labrada, 65, told IPS.

Labrada has presided over the people’s council (local administration organisation) for 13 years, which covers the Litoral neighbourhood and a two-kilometer stretch of coastline that is home to about 5,000 people.

Also, in her jurisdiction, about 0.2 square kilometres of mangroves have been deforested or are in very poor condition.

A mangrove forest in Manzanillo Bay, eastern Cuba. Credit: Jorge Luis Baños / IPS

A mangrove forest in Manzanillo Bay, eastern Cuba. Credit: Jorge Luis Baños / IPS

Protective mangroves

According to the United Nations Environment Programme (UNEP), mangroves extract up to five times more carbon than land forests, raise the ground level and thus slow down the rise in sea level.

This coastal ecosystem, typical of tropical and subtropical areas, usually consists of a swamp forest, a strip of black mangrove (Avicennia germinans) and a strip of red mangrove (Rhizophora mangle), the barrier closest to the sea, whose trunks absorb the impact of waves and protect against extreme weather conditions.

Mangroves act as nurseries for fish fry and as havens for honey bees, among a huge variety of fauna and flora.

They also serve as a protective area for fresh water. If degraded, salt from marine waters would more easily enter underground water basins, contaminating the drinkability of this liquid and disabling wells located miles inland.

Blanca Estrada, administrative coordinator of the Mi Costa project on behalf of the provincial government of Granma in eastern Cuba. Credit: Jorge Luis Baños / IPS

Blanca Estrada, administrative coordinator of the Mi Costa project on behalf of the provincial government of Granma in eastern Cuba. Credit: Jorge Luis Baños / IPS

Protection from the sea

The Litoral neighbourhood is one of the most vulnerable in the municipality to climate change because it borders the mangroves, but it is not the only one in this situation.

In Manzanillo there are six people’s councils that are in direct contact with the coast. Some 60,000 inhabitants suffer the consequences, almost half of the total population of the municipality located 753 kilometres east of Havana.

The need to find solutions to the problem of rising sea levels was therefore born in the rural neighborhoods and villages of Manzanillo.

To counteract this prospect, small community projects emerged in 2018, also promoted by a national plan to tackle climate change known as Tarea Vida, which had been launched by the central government a year earlier.

As a result, 23 initiatives were set up in the municipality, which were later grouped in a single nationwide project called Mi Costa, the project’s coordinator in Manzanillo, Margot Hernández, told IPS.

Mi Costa seeks to create conditions of resilience to climate change through adaptation solutions based on strengthening the benefits provided by coastal ecosystems. In essence, its main task is to reforest and rehabilitate mangroves.

“In addition, we have to change living habits. That’s what we are working on,” Hernández added.

Ditch built in the middle of a mangrove swamp to contribute to its drainage and the recirculation of saline and fresh water, in the municipality of Manzanillo, eastern Cuba. Credit: Courtesy of Mi Costa in Manzanillo

Ditch built in the middle of a mangrove swamp to contribute to its drainage and the recirculation of saline and fresh water in the municipality of Manzanillo, eastern Cuba. Credit: Courtesy of Mi Costa in Manzanillo

Behind deforestation

Manzanillo, because of its low isometry and its 25 kilometres of coastline, is in a serious state of environmental vulnerability.

The deforested areas of mangroves amount to 708.7 hectares, being the most affected concentrated at the river mouths.

With a weakened natural containment barrier, the saline waters penetrate the riverbeds and, for example, in the Yara River, in the north of the municipality, they do so up to seven kilometres inland, according to Leandro Concepción, the project coordinator for the Granma Provincial Delegation of Hydraulic Resources.

In any case, the salinity penetrates through underground water basins and, according to Hernández, the coordinator in Manzanillo, “there are people’s artesian wells, which were once used for consumption but are now salinized.”

Mangrove deforestation has several causes: the lack or blockage of channels hinders the ebb and flow of the tide and alters the exchange of freshwater with marine waters.

It is also affected by the invasion of invasive exotic species such as the arboreal Ipil Ipil or guaje (Leucaena leucocephala), anthropogenic human intervention through the construction of infrastructure, agricultural and livestock practices near the coast, and even the felling of mangroves to make charcoal.

A group of people receive a given by the Mi Costa project at the Manzanillo Training Centre. Credit: Courtesy of Mi Costa in Manzanillo

A group of people receive a class given by the Mi Costa project at the Manzanillo Training Center. Credit: Courtesy of Mi Costa in Manzanillo

According to Labrada, the community leader in Litoral, several houses have been built almost adjacent to the mangrove, without the corresponding construction permits. Moreover, state-owned industrial infrastructures, such as a shoe factory and an inactive sawmill, cause the same damage.

Coastal and river pollution from industrial waste dumping also depresses coastal ecosystems.

For decades, the region’s sugar mills and rice industry dumped their waste into the rivers, Blanca Estrada, administrative coordinator of Mi Costa on behalf of the Granma provincial government, told IPS.

This situation is one of the examples of climate injustice in the area: upstream, the industrial sector caused environmental havoc that affected mangrove health and, at the end of the chain, the quality of life of coastal residents, making them more vulnerable to climatic events.

In 2023, decisive measures were taken to solve the problem and the few active factories no longer discharge their waste into the sea or use filters. In the second half of 2024, the results have already begun to show: “The migratory birds have returned, something you didn’t see months ago,” said Estrada.

However, the effects of climate change still persist in Manzanillo.

“The environmental situation today is quite complex for the keys,” Víctor Remón, director of Manzanillo’s Department of Territorial Development, which belongs to the local government, told IPS.

The municipality’s territory contains an extensive cay of 2.44 square kilometres, but Cayo Perla has already been submerged under the waters of the Gulf of Guacanayabo.

“It disappeared six or seven years ago. It was a beautiful key, with beautiful white sands. There was a tourist facility from where you could see the city of Manzanillo,” Remón said.

For his part, Roberto David Rosales, fisherman and Mi Costa contributor, remembers a path he used to walk along the shore until last year; now it has been ‘swallowed’ by the sea.

“Almost two meters were lost in this area in one year. These are things that force us to be protectors of the mangroves. The Mi Costa project came at the right time,” he told IPS.

Margot Hernández (left), coordinator of the Mi Costa project in Manzanillo, opens the training centre in the city of Manzanillo. Credit: Courtesy of Mi Costa in Manzanillo

Margot Hernández (left), coordinator of the Mi Costa project in Manzanillo, opens the training centre in the city of Manzanillo. Credit: Courtesy of Mi Costa in Manzanillo

Steps towards a solution

Mi Costa was made official in December 2021, but heavy work began in 2023, due to a pause caused by the COVID pandemic.

In Manzanillo, the project brought together about 100 collaborators, who were divided into small community groups of about 10 people, who support the monitoring and cleaning of mangroves and ditches and awareness-raising among the population.

Labrada also has its own people’s council group, composed of six women and four men.

In addition, training centres have been set up in the municipality on climate change adaptability, environmental safeguards, gender and other issues. To date, 10,500 people have been trained.

“We are working with the coast dwellers, because the issue is that people don’t leave the coasts, but that they stay and learn to live there, taking care of them,” said Estrada, the government coordinator.

Sunset on the boardwalk in the eastern Cuban city of Manzanillo. Credit: Jorge Luis Baños / IPS

Sunset on the boardwalk in the eastern Cuban city of Manzanillo. Credit: Jorge Luis Baños / IPS

They have also built 1,300 meters of ditches, using picks and shovels, to achieve a form of water rotation, but this figure has yet to be multiplied.

The immediate challenge is to finish building the nursery where the mangrove seedlings will sprout and then be planted in the deforested areas.

“Once we have the nursery, there will be no difficulty at all in Granma to begin the process of rehabilitating the mangroves,” Norvelis Reyes, Mi Costa’s main coordinator in the province, told IPS.

Mi Costa’s area of action in Granma covers, in addition to the coast of Manzanillo, the northern municipalities of Yara and Río Cauto.

Nationwide, 24 communities in the south of Cuba are involved in resilience actions (1,300 kilometres of coastline), of which 14 are at risk of disappearing due to coastal flooding by 2050, including Manzanillo.

The southern coast of this Caribbean island country was chosen because it is more vulnerable to climate change and sea level rise, given its lower geographical isometry than in the north.

In addition, the south also has a higher concentration of mangroves, making it more necessary and effective to build coastal resilience based on adaptation and focused on the rehabilitation and reforestation of these ecosystems.

While implemented by the communities themselves and with the participation of the villagers, the project is supervised by the Ministry of Science, Technology and Environment and the country office of the United Nations Development Programme (UNDP).

The Green Climate Fund provided funding of USD 23.9 million, while Cuban state institutions contributed USD 20.3 million.

The ultimate goal will be to restore some 114 square kilometres of mangroves, 31 square kilometres of swamp forest and nine square kilometres of grassy swamps in eight years. After that, a period of 22 years will be dedicated to the operation and maintenance of the implemented actions.

It is estimated that more than 1.3 million people will benefit on this Caribbean island, the largest in the region and home to 11 million people.

UN Bureau Report

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