Chad recorded more than 1.3 million internal displacements in 2024 linked to flooding, the highest level ever recorded for disasters in a country that barely contributes to global emissions. At the end of 2024, sub-Saharan Africa counted 38.8 million people living in internal displacement, roughly 46% of the global total according to the IDMC. Sub-Saharan Africa represents approximately 1.9% of cumulative global fossil fuel and industrial CO₂ emissions over the 1750-2021 period, depending on the data scope used. The gap between responsibility and vulnerability is the best documented of all climate justice issues, and it calls for an architectural response, not charity.
The essentials
- Sub-Saharan Africa counted 38.8 million people living in internal displacement at the end of 2024, roughly 46% of the global total, across all causes (IDMC). Sub-Saharan Africa represents approximately 1.9% of cumulative global fossil fuel and industrial CO₂ emissions over the 1750-2021 period, depending on the data scope used.
- Chad recorded 1.3 million displaced persons in 2024 due to flooding alone, an absolute record that illustrates the shift from punctual climate crises to a structural flow.
- African displacements result from a combination of repeated climate shocks, rural poverty, and infrastructure deficits: none of these three factors yields without deliberate investment.
- The cost of preventive adaptation is lower than that of repeated humanitarian cycles, according to available estimates, but international climate financing remains overwhelmingly oriented toward mitigation rather than resilience for the most exposed countries.
- The financial and institutional instruments enabling escape from the post-disaster cycle to build permanent resilience will structure debate through 2035.
The numerical asymmetry surpasses intuition
Roughly 46% of the world’s internally displaced persons lived in sub-Saharan Africa at the end of 2024 according to the IDMC. Put that way, the figure seems striking. But you have to go beyond the contrast to understand its mechanics.
According to the IPCC, the rate of temperature increase in Africa has generally been faster than the global average. Rainfall there is becoming both more intense and more irregular simultaneously: fewer rainy days, but more violent episodes. Lake Chad has lost more than 90% of its surface area since the 1960s. Agricultural lands around the lake once fed millions of families; they are today partially desertified or prone to flooding depending on the season. When a family loses its harvest two years in a row, it leaves.
When the village well runs dry six months a year, the young leave. African climate displacements are slow, cumulative, and often invisible to official statistics until an extreme episode suddenly makes them massive.
The Chadian case is emblematic. In 2024, flooding affected almost all 23 provinces of Chad. The floods triggered more than 1.3 million internal displacements; nearly 1.2 million people lived displaced at the end of 2024, displaced in a matter of weeks. Chad already ranks at the bottom of human development indices; water infrastructure and services are severely inadequate; its health system operates at maximum capacity. A climate disaster under these conditions produces a cascade: displacement, food disruption, pressure on camps, intercommunal tensions.
Displacement constitutes the visible phase of the crisis, not its conclusion.
The factors behind Africa’s vulnerability to climate-driven displacement
African vulnerability to climate-driven displacement stems from three mutually reinforcing factors. The first is structural: dependence on rain-fed agriculture that directly exposes rural households to climate variations. In sub-Saharan Africa, roughly 60% of the active population works in agriculture, and the vast majority of this agriculture depends on rainfall, without irrigation or crop insurance. A prolonged drought destroys a family’s sole source of income in a single season.
The second factor is geographic: population concentration in zones already exposed to climate extremes. The Sahel belt, the Lake Chad basin, the low-lying coasts of Mozambique or Malawi combine high rural density and maximum exposure. Climate models suggest these zones will see their frequency of floods and droughts increase over coming decades, not as a distant probability, but as a trend already being measured.
The third factor is institutional. The states most exposed are precisely those with the most limited capacity to anticipate, absorb, and respond to shocks. Chad devotes a significant share of its public revenues to debt servicing and security spending. The Central African Republic, South Sudan, Niger—all in the group of countries most exposed to climate-driven displacement—also rank among those whose disaster risk management systems are least developed. Money is lacking for dikes, early warning systems, mapping of at-risk zones, and social protection networks that would make families less fragile in the face of shocks.
Global climate financing misses its target
The Green Climate Fund, successive COP commitments, adaptation windows at multilateral development banks: all these instruments exist. Their track record is disappointing on one precise point: the share devoted to adaptation, as opposed to mitigation, remains marginal. Mitigation is cutting emissions, installing wind turbines, electrifying transport, planting forests. Adaptation is making societies capable of living with climate change already underway: dikes, heat-resistant crop varieties, flood warning systems, planned relocation from submersible zones.
African countries contribute little to global emissions but bear particularly high climate vulnerability. The imbalance in international financing reproduces the imbalance in emissions: major economies prioritize mitigation investments. Adaptation in sub-Saharan Africa, which does not displace their immediate interests, is chronically underfunded.
The promise of $100 billion annually made in Copenhagen in 2009, roughly 130 euros per inhabitant of developing countries, each year, was only met with delay and with an insufficient proportion for adaptation. At COP29 in Baku in 2024, a target of $300 billion annually by 2035 was agreed, but its portion dedicated to adaptation in Africa remains to be specified in implementation mechanisms. COP promises have a long history of partial non-fulfillment: the credibility of this commitment will depend on binding instruments put in place by 2027.
From repeated emergency to permanent resilience
The dominant humanitarian model in response to African climate-driven displacements tends to be reactive, intervening after the disaster rather than before. This cycle generates substantial costs. According to the IDMC, the estimated worldwide cost of a year of displacement was $20.5 billion in 2020, including housing, health, education, security, and lost income. The comparison is not new, but it remains ignored in actual financial architecture.
Exiting this cycle requires three types of investments that some countries and institutions are beginning to test. The first is early warning and preparedness. The CREWS program (Climate Risk and Early Warning Systems), supported by several governments and multilateral organizations, finances meteorological warning systems in countries like Niger, Burkina Faso, and Tanzania. The goal: transform a flood forecast into organized evacuation rather than disaster. Available assessments suggest that each euro invested in early warning saves between six and fifteen euros in emergency response, a wide range that depends heavily on the quality of local organization, but whose lower bound remains convincing.
The second type of investment concerns diversification of rural income. When a family no longer depends exclusively on its harvest, it better withstands a poor season. Programs for rural electrification, agricultural microfinance, or training in crafts enable reducing household vulnerability without forcing migration. Mali, Rwanda, and Ethiopia have experimented with approaches combining conditional transfers and training, with results on reducing forced migration that merit scaling up, even if rigorous evaluations remain insufficient.
The third type is planned relocation from structurally at-risk zones. Some land can become uninhabitable due to progressive soil degradation, rising waters, or aridification. Anticipated relocation with habitat and service reconstruction generally comes with costs and trauma different from emergency evacuation. Bangladesh has developed recognized expertise in this domain since the floods of the 1990s: its lessons are transferable, but they assume political will and administrative capacities that few Sahelian countries now possess.
Concrete requirements for the 2035 scenario
The 2035 horizon is when current climate commitments—emissions reductions, adaptation funds, zero displacement targets—are supposed to produce measurable effects. Two trajectories are emerging for sub-Saharan Africa, neither preordained.
In the first, climate financings remain overwhelmingly oriented toward mitigation in major economies, humanitarian aid continues responding to crises instead of preventing them, and the most fragile Sahelian states find themselves trapped in cycles of increasingly rapid crises. The IDMC recorded 38.8 million people in internal displacement in sub-Saharan Africa at the end of 2024; without adequate institutional response and accelerating climate trends, this number could increase by 2035, but such projections depend heavily on policies implemented.
In the second trajectory, several positive signals already visible are amplified. The African Union adopted in 2022 its policy framework on migration, forced displacement, and human trafficking, which explicitly integrates the climate dimension and calls for mechanisms protecting internally displaced persons. Countries like Kenya and Ghana are developing national adaptation plans that move beyond declarations to include specific budget lines and institutional responsibilities. The World Bank’s Global Facility for Disaster Risk Reduction (GFDRR) finances resilient infrastructure projects in some twenty African countries. These signals are still insufficient relative to the scale of needs, but they prove that institutional mechanics can function when financing follows.
What makes the difference between the two trajectories, in practice, hinges on three levers. The first is the share of adaptation in climate financing: in 2022, it represented 28% of mobilized climate financing according to the OECD; increasing this share can enable investments in early warning and resilient infrastructure to scale up. The second is the creation of financing mechanisms automatically triggered by climate indicators, on the model of catastrophe bonds or parametric insurance: instead of waiting for a government to launch an emergency appeal after the disaster, financing triggers when precipitation exceeds a threshold or when food stocks fall below a critical level. The third lever is the administrative capacity of African states themselves: no external financing replaces territorial planning that identifies zones for evacuation, safe migration corridors, relocation sites.
The question of permanent adaptation connects here to a broader debate on international financial transfers: who finances global common goods, under what rules, with what accountability mechanisms. The answer to African climate displacement cannot be separated from this architecture.
The actors building resilience now
Amid the diagnosis, institutions and governments are constructing concrete responses that would be inaccurate to ignore.
IGAD, the Intergovernmental Authority on Development comprising seven countries in the Horn of Africa, has established an ICPAC (IGAD Climate Prediction and Applications Centre) that produces seasonal forecasts used by the Ethiopian, Kenyan, and Somali governments to plan their drought responses. The system works: during the 2022 drought in the Horn of Africa, early warnings enabled several Kenyan districts to prepare food stocks before the crisis peaked, reducing the number of people in food emergency situations compared to previous crises.
In Mozambique, after Cyclone Idai in 2019, one of the deadliest cyclones ever recorded in southern Africa, the government launched a reconstruction program with World Bank support integrating cyclone-resistant building standards and relocation of entire neighborhoods to less exposed zones. The process is slow and insufficiently financed, but it represents a shift: building to resist rather than rebuilding afterward.
At the continental level, the African Union Commission has been pushing since 2021 for a strengthened framework protecting climate-displaced persons. The Kampala Convention (2009) on internally displaced persons, the world’s most advanced African framework, explicitly covers displacements linked to climate change effects and natural disasters, but its implementation remains uneven. Strengthening legal frameworks and their application can improve effective access to rights; internally displaced persons already have formal rights under existing norms, notably on housing and education.
The countries that have contributed most to warming will have to finance, structurally and not episodically, the resilience of countries that bear the bulk of its consequences. Technical responses exist. The obstacle is political and will play out in climate and budget negotiations in the years ahead.
Sources
- IOM World Migration Report 2026, Chapter 3: Africa
- IDMC Global Report on Internal Displacement 2026, Internal Displacement Monitoring Centre
- Kampala Convention (2009), African Union, framework on internal displacement
- CREWS program (Climate Risk and Early Warning Systems), World Meteorological Organization / CREWS Secretariat
- Global Facility for Disaster Risk Reduction (GFDRR), World Bank
- ICPAC, IGAD Climate Prediction and Applications Centre, Nairobi
