By Abbas Nazil
The Sundarbans, the world’s largest mangrove forest, is experiencing mounting ecological and livelihood pressures as rising salinity, failing embankments and dwindling freshwater supplies threaten the food and incomes of millions of people who depend on the fragile delta ecosystem.
The warning emerged from a recent assessment of the Sundarbans, where communities are increasingly struggling with dry ponds, degraded farmland and declining fish production as environmental pressures intensify across the Ganges-Brahmaputra-Meghna delta.
The Sundarbans supports about four million people who depend on the ecosystem for food, income and shelter, making its deterioration not only an environmental concern but also a growing socioeconomic crisis.
Researchers who visited the region in May 2026 found ponds that had previously supported families through fish production had dried up, leaving some households to form self-help groups, seek wage employment or consider sending family members to cities in search of alternative livelihoods.
The ecological changes are being driven by several interconnected pressures, including increasing salinity, erosion and inadequate maintenance of embankments designed to protect communities and agricultural land from tidal waters.
Saline water is increasingly penetrating areas that previously supported rice cultivation, reducing agricultural productivity and leaving some fields capable of producing only one harvest instead of two.
Freshwater ponds used for aquaculture are also becoming increasingly brackish, affecting the availability and value of fish species that communities rely on to support household expenses, education and other basic needs.
The deterioration is compounded by the weakening of embankments, which are reportedly being repaired with temporary materials such as mud and bamboo as erosion continues faster than communities can carry out adequate reinforcement.
Researchers said the crisis demonstrates how climate vulnerability can develop gradually, with repeated environmental pressures eventually pushing ecosystems and households beyond their ability to cope.
Unlike sudden disasters such as cyclones and floods, the effects of salinisation and ecological degradation can accumulate over several years, making them less visible to policymakers and international funding systems.
This creates a significant challenge for climate adaptation financing, which is often structured around clearly identifiable disasters rather than the slower environmental changes that progressively undermine livelihoods.
Although climate finance reaches both the Bangladeshi and Indian sides of the Sundarbans, researchers argue that insufficient funding reaches individual households facing decisions over whether to abandon farming, reduce fishing activities, seek factory employment or sell livestock.
Much of the available funding is directed towards projects such as embankment construction and mangrove restoration, which remain important but may not directly address the immediate livelihood challenges confronting affected families.
The situation in the Sundarbans could also offer an indication of what other major river deltas may experience as climate and environmental pressures intensify.
Deltas including the Mekong in Southeast Asia, the Nile in Egypt and the Niger Delta in southern Nigeria are facing related challenges involving salinity, ecosystem degradation and pressure on communities dependent on natural resources.
The Sundarbans therefore represents more than an isolated environmental crisis, as its experience demonstrates how gradual ecological decline can outpace the institutions and financial systems intended to protect vulnerable communities.
Researchers warned that without adaptation measures capable of addressing these slow-moving pressures, other delta communities could face similar livelihood losses and displacement.
The experience of the Sundarbans highlights the need for climate adaptation policies and financing mechanisms that respond not only to catastrophic events but also to the less visible environmental changes that steadily erode the ability of communities to survive.
As mangrove ecosystems continue to face rising pressures from climate change, salinity, erosion and human activity, the fate of the Sundarbans could provide an important warning for millions of people living in vulnerable coastal and river-delta communities around the world.
