Climate risk and vulnerabilities of Bangladesh
Bangladesh is one of the world’s most climate- and disaster-vulnerable delta countries. Its risk profile is shaped by the Ganges–Brahmaputra–Meghna river system, low-lying coastal and floodplain geography, high population density, monsoon rainfall, cyclone exposure from the Bay of Bengal, riverbank erosion, salinity intrusion, sea-level rise, and strong dependence on climate-sensitive livelihoods such as agriculture, fisheries, livestock, water resources, and informal urban employment. Bangladesh’s National Adaptation Plan identifies major climate-induced hazards including tropical cyclones and storm surges, monsoon floods, flash floods, droughts, sea-level rise, salinity intrusion, ocean warming, and riverbank erosion. (FAOLEX)
Bangladesh is highly vulnerable to climate change and multi-hazard risks, including cyclones, storm surges, coastal flooding, monsoon floods, flash floods, riverbank erosion, droughts, salinity intrusion, sea-level rise, heat stress, landslides, waterlogging, and climate-sensitive disease risks. Its low-lying deltaic geography, dense population, extensive river systems, exposed coastal belt, poverty pockets, rapid urbanization, and dependence on agriculture, fisheries, water resources, and coastal ecosystems increase the scale and complexity of climate risk. Climate change is expected to intensify these vulnerabilities through rising temperatures, heavier and more erratic rainfall, stronger flood and storm-surge impacts, increasing salinity, sea-level rise, heat-related health and productivity losses, and growing pressure on food security, water security, infrastructure, livelihoods, public health, and social protection systems.
Bangladesh is highly exposed and vulnerable to climate change and multi-hazard risks due to its low-lying deltaic geography, dense population, monsoon climate, extensive river systems, exposed coastal belt, poverty pockets, rapid urbanization, and dependence on climate-sensitive livelihoods. The country faces recurrent and severe risks from cyclones, storm surges, coastal flooding, monsoon floods, flash floods, riverbank erosion, droughts, salinity intrusion, sea-level rise, heat stress, landslides, waterlogging, and climate-sensitive disease risks. Climate change is expected to intensify these risks through rising temperatures, heavier and more erratic rainfall, stronger flood and storm-surge impacts, sea-level rise, salinity intrusion, heat-related health and productivity losses, and growing pressure on agriculture, fisheries, water security, infrastructure, ecosystems, public health, and vulnerable communities. Strengthening multi-hazard early warning systems, impact-based forecasting, climate-resilient infrastructure, coastal protection, river erosion management, climate-smart agriculture, urban drainage, heat-health planning, shock-responsive social protection, disaster risk financing, and locally led adaptation is essential to reduce losses and protect Bangladesh’s development gains.
1. Multi-hazard exposure
Bangladesh is exposed to a broad range of hydrometeorological, coastal, riverine, and geophysical hazards. The World Bank Climate Change Knowledge Portal ranks Bangladesh as having extremely high exposure to flooding, including riverine, flash, and coastal flooding, as well as high exposure to tropical cyclones. (Climate Change Knowledge Portal) GFDRR also describes Bangladesh as highly exposed to floods, cyclones, and earthquakes, confirming that the country’s risk profile is not limited to climate hazards alone. (GFDRR)
The major hazard types include:
| Hazard type | Main risk pathways |
|---|---|
| Riverine floods | Overflow of the Ganges, Brahmaputra, Meghna and tributaries; crop loss; infrastructure damage; displacement |
| Flash floods | Sudden upstream rainfall, especially in haor and northeastern areas; damage to boro rice, roads, and settlements |
| Cyclones and storm surges | Coastal inundation, embankment failure, housing damage, saline contamination, livelihood disruption |
| Riverbank erosion | Loss of land, housing, schools, markets, farmland, and repeated displacement |
| Drought | Rainfall deficit, crop stress, groundwater pressure, food and livelihood insecurity |
| Salinity intrusion | Drinking-water contamination, soil salinity, reduced agricultural productivity, health impacts |
| Urban flooding and waterlogging | Drainage congestion, intense rainfall, unplanned urbanization, waste blockage |
| Heat stress | Health impacts, labour-productivity loss, urban heat-island effects, occupational risks |
| Landslides | Hill-slope instability, especially in Chattogram Hill Tracts and other hilly areas |
| Earthquakes | Urban building vulnerability, infrastructure exposure, emergency response complexity |
2. Flood, cyclone, and storm-surge vulnerability
Flooding is Bangladesh’s most recurrent and geographically widespread hazard. Monsoon floods affect large parts of the floodplain, flash floods threaten the northeast and hilly catchments, and coastal floods are amplified by storm surge, high tides, embankment breaches, sea-level rise, and drainage congestion. GFDRR reports that between 2000 and 2023, disasters such as floods and tropical cyclones affected about 130 million people in Bangladesh and caused around US$13.6 billion in total damages. (GFDRR)
Cyclone and storm-surge risk remains severe along the coastal belt, including Khulna, Satkhira, Bagerhat, Patuakhali, Barguna, Bhola, Barishal, Noakhali, Lakshmipur, Feni, Chattogram, and Cox’s Bazar. Bangladesh has made major progress in cyclone preparedness through shelters, warning dissemination, volunteer networks, and evacuation systems, but residual risk remains high because of dense coastal settlements, livelihood dependence on agriculture and fisheries, embankment fragility, salinity intrusion, and limited protection for some exposed chars and islands.
3. Climate change as a risk multiplier
Climate change is acting as a risk multiplier in Bangladesh by intensifying existing hazards rather than creating entirely new ones. Rising temperatures, changing rainfall patterns, more intense rainfall, sea-level rise, stronger coastal inundation risk, drought stress, salinity intrusion, and ecosystem degradation can combine to produce cascading impacts on agriculture, water, health, infrastructure, migration, poverty, and public finance. Bangladesh’s NAP 2023–2050 frames adaptation as a national development priority because climate hazards threaten food systems, water resources, coastal zones, infrastructure, health, biodiversity, and livelihoods. (FAOLEX)
Recent severe flooding illustrates the continuing scale of exposure. Reuters reported that Bangladesh’s 2024 floods affected more than 5 million people, with hundreds of thousands seeking refuge in shelters and major needs for food, clean water, medicine, and access to remote affected areas. (Reuters)
4. Coastal vulnerability, sea-level rise, and salinity intrusion
Coastal Bangladesh is one of the country’s highest-risk zones because cyclones, storm surges, tidal flooding, riverbank erosion, sea-level rise, drainage congestion, and salinity intrusion overlap in the same geographic space. Salinity affects drinking water, soil fertility, crop choices, livestock, aquaculture, freshwater ecosystems, maternal health, kidney health, and women’s unpaid care burdens.
The World Bank notes that rising sea levels and changes in freshwater flow are intensifying river salinity in southwest coastal Bangladesh, with significant implications for adaptation planning, fisheries, and coastal livelihoods by 2050. (Open Knowledge Repository) Earlier World Bank analysis also warned that coastal populations in southern Bangladesh are on the front line of salinity intrusion because of continuing sea-level rise. (World Bank)
5. Agriculture, food security, and rural livelihoods
Agriculture remains one of the most climate-sensitive sectors in Bangladesh. Rice, vegetables, pulses, livestock, aquaculture, fisheries, and wage labour are exposed to floods, droughts, salinity, heat stress, pests, disease outbreaks, waterlogging, cyclones, and river erosion. In the coastal belt, salinity changes crop suitability and reduces freshwater availability; in the northwest and Barind areas, drought and groundwater stress threaten irrigation-dependent agriculture; in the northeast haor region, early flash floods can destroy boro rice before harvest.
Key agricultural vulnerabilities include:
| Sub-sector | Main climate risks |
|---|---|
| Rice production | Floods, flash floods, drought, salinity, heat stress, crop-calendar disruption |
| Coastal agriculture | Soil salinity, waterlogging, storm surge, embankment failure, saline irrigation water |
| Fisheries and aquaculture | Salinity shifts, cyclones, pond flooding, disease, ecosystem degradation |
| Livestock | Heat stress, fodder shortage, water scarcity, disease risk during floods |
| Agricultural labour | Heat exposure, wage loss after disasters, seasonal unemployment |
| Food security | Crop losses, price shocks, market disruption, reduced purchasing power |
6. Water security, WASH, and public health
Bangladesh faces both too much water and too little safe water. Floods contaminate tube wells, ponds, latrines, and surface-water systems, while drought and salinity reduce freshwater availability in dry seasons and coastal areas. Urban waterlogging and poor drainage can increase disease transmission, while coastal salinity affects household water collection burdens and health outcomes.
Heat is becoming a major health and productivity risk. Reuters reported that rising heat caused Bangladesh economic losses of up to US$1.78 billion in 2024, with heat-related health issues contributing to the loss of about 25 million workdays; the report also noted increased risks of diarrhea, respiratory illness, fatigue, and mental-health impacts, with women and older people disproportionately affected. (Reuters)
7. Urban climate risk
Bangladesh’s cities face increasing risk from urban flooding, waterlogging, heat stress, poor drainage, informal settlements, waste-clogged canals, low-lying expansion areas, and infrastructure overload. Dhaka, Chattogram, Khulna, Sylhet, Barishal, Rajshahi, Rangpur, and secondary towns face different combinations of flood, heat, drainage, water-supply, and public-health risks.
Urban vulnerability is particularly high in informal settlements where households often face weak housing, insecure tenure, limited drainage, poor sanitation, overcrowding, low savings, and limited access to insurance or recovery finance.
8. Social vulnerability and displacement
Climate risk in Bangladesh is deeply social. The most vulnerable groups include poor rural households, landless labourers, smallholder farmers, fishing communities, coastal households, char dwellers, river-erosion-affected families, informal urban settlers, women-headed households, children, older persons, people with disabilities, Indigenous communities, and climate migrants.
Riverbank erosion is especially important because it causes repeated displacement, land loss, school disruption, livelihood erosion, and movement toward cities or new char lands. Coastal salinity and cyclone impacts can also drive distress migration, particularly where agriculture, fisheries, drinking-water access, and housing security are repeatedly affected.
9. Sector-specific vulnerability summary
| Sector | Main climate and hazard risks |
|---|---|
| Agriculture and food security | Floods, droughts, salinity, heat stress, crop loss, pests, reduced productivity |
| Fisheries and aquaculture | Salinity change, storm surge, pond flooding, disease, ecosystem degradation |
| Water resources and WASH | Salinity intrusion, flood contamination, drought, groundwater stress, arsenic and quality concerns |
| Coastal infrastructure | Cyclones, storm surge, embankment failure, erosion, sea-level rise |
| Urban settlements | Drainage congestion, waterlogging, heat stress, informal settlement exposure |
| Transport and connectivity | Flooded roads, damaged bridges, river erosion, disrupted rural access |
| Health | Heat illness, diarrhoeal disease, vector-borne disease, respiratory illness, mental-health stress |
| Education and public services | School closure, shelter use, infrastructure damage, service interruption |
| Ecosystems | Sundarbans stress, wetland degradation, river salinity, biodiversity loss |
10. Priority resilience needs
Bangladesh’s resilience agenda should prioritize multi-hazard early warning systems, impact-based forecasting, cyclone and flood preparedness, coastal embankment strengthening, nature-based coastal protection, riverbank erosion management, drought monitoring, heat-health action planning, climate-resilient agriculture, salinity-resilient water systems, resilient urban drainage, shock-responsive social protection, disaster risk financing, and locally led adaptation.
A practical resilience package for Bangladesh should include:
| Priority area | Key actions |
|---|---|
| Early warning and anticipatory action | Impact-based flood, cyclone, heat, drought, lightning, and landslide warnings; last-mile dissemination |
| Coastal resilience | Embankment upgrading, cyclone shelters, mangrove restoration, drainage improvement, salinity management |
| Flood and river management | Basin-scale forecasting, erosion-risk mapping, resilient roads, raised homesteads, flood shelters |
| Climate-resilient agriculture | Salt-, flood-, drought-, and heat-tolerant crops; crop advisories; insurance; water-saving irrigation |
| Urban resilience | Drainage restoration, canal protection, heat-risk planning, solid-waste management, risk-informed zoning |
| Water security | Rainwater harvesting, managed aquifer recharge, desalination where viable, pond sand filters, safe WASH systems |
| Social protection | Scalable cash transfers, anticipatory finance, livelihood recovery support, protection for displaced households |
| Risk governance | Integrated DRR-CCA planning, local government capacity, climate budget tagging, risk-informed public investment |
Department of Disaster Management (DDM)
Department of Disaster Management (DDM) under the Ministry of Disaster Management and Relief was set up in November 2012 following the enactment of the Disaster Management Act 2012. The Directorate of Relief and Rehabilitation (DRR) and Disaster Management Bureau (DMB) were established in 1973 and 1992 respectively which merged and formed Department of Disaster Management in 2012. The Department has the mandate to implement the objectives of Disaster Management Act by reducing the overall vulnerability from different impacts of disaster by undertaking risk reduction activities; conducting humanitarian assistance programs efficiently to enhance the capacity of poor and disadvantaged as well as strengthening and coordinating programmes undertaken by various government and non-government organizations related to disaster risk reduction and emergency response. DDM is responsible to execute the directions, recommendations by the Government in connection with disaster management as well as the national disaster management principles and planning.
DDM headed by the Director General focuses on networking and collaborating with the various Ministries, Departments and Scientific, Technical, Research, Academic institutions, Development Partners, UN Agencies and non-government Organizations within and outside the Government working on various aspects of disaster risk reduction and response management.
DDM conducts research, organizes workshops and training programmes, publishes its reports and documents and provide various policy advisory services to the concerned Ministry of the Government of Bangladesh.
DDM has the vision to be recognized as a vibrant Centre of Excellence for knowledge, research and capacity building on disaster management for the Disaster Management professionals across level.
MISSION & VISION The Vision, the Mission, the Function and the Modalities for setting up the Department of Disaster Management (DDM) were determined in the light of Disaster Management Act 2012 and in consultation with the Ministry of Disaster Management and Relief.
VISION
The Department of Disaster Management (DDM) would be a vibrant department of excellence for Disaster Risk Reduction (DRR) mainstreaming into the Disaster Management Programme; vulnerability reduction of people, especially the poor and disadvantaged from different impacts of disasters; knowledge, research and capacity building on the whole cycle of disaster management in the light of DM act 2012.
MISSION
The Department of Disaster Management (DDM) would serve the Ministry of Disaster Management and Relief to implement the objectives of the Disaster Management Act 2012 by undertaking risk reduction activities; responding to disaster events efficiently as well as strengthening and coordinating programs undertaken by different stakeholders related to DRR and DRM.