83.4 million people were living in internal displacement at the end of 2024, of which 9.8 million due to disasters. Climate disasters explain the majority of new internal displacements. This massive reality contrasts with European obsession with cross-border migrations: the bulk of forced mobility occurs within affected countries, far from Western political radar.
The European migration debate misses the mark. While the EU toughens its borders and finances walls, 45.8 million internal climate displacements occurred in 2024, more than double displacements due to conflicts. This dissonance will become a geopolitical issue: will rich countries finance local resilience or wait for arrivals at borders?
The Essentials
- 65.8 million internal displacements in 2024, of which 45.8 million linked to climate disasters according to the International Organization for Migration
- Over 400 million internal climate displacements over the last decade, 20 times international climate migrations
- Asia-Pacific concentrates approximately 52% of internal climate displacements in 2024
- Only $1.3 billion mobilized in 2023 for climate adaptation in least developed countries, compared to $83.3 billion for migrations and borders
Forty-Six Million Invisible Climate Victims
Figures from the International Organization for Migration (IOM) redefine the geography of population movements. In 2024, 45.8 million people were displaced within their country by climate disasters. Cyclones, floods, droughts, and wildfires provoke twice as many displacements as armed conflicts, which affect 20.1 million people.
This forced mobility remains largely invisible because it does not cross borders. A Bangladeshi farmer driven by floods to Dhaka, a Philippine family evacuated by a typhoon to Manila, Somali herders fleeing drought to Mogadishu: their journeys appear in no international migration statistics.
Asia-Pacific dominates this geography with approximately 24 million internal climate displacements, representing 52% of the global total. The Philippines leads with 5.4 million displaced, followed by China (4.7 million) and Bangladesh (3.2 million). These three countries account for nearly 30% of global climate displacements.
The decade 2015-2024 reveals the scale of the phenomenon: 401.6 million internal climate displacements, compared to only 20 million international climate migrations. The internal-to-external ratio exceeds 20 to 1. This proportion is explained by costs: moving within one’s country costs less than crossing a border, and family networks facilitate temporary reception.
Europe Finances Walls Rather Than Resilience
The European Union invests massively in migration control while neglecting climate adaptation that would reduce displacements at the source. The budget of the Frontex agency tripled between 2019 and 2024, rising from 320 million to 845 million euros. In the same period, the EU mobilized 265 million euros in 2023 for climate adaptation in the least developed countries.
This asymmetry reveals a defensive logic: treating consequences at borders rather than causes in territories of origin. The European Pact on Migration and Asylum, adopted in 2024, allocates 15 billion euros over seven years to “externalize” migration management toward Africa and the Middle East. No equivalent envelope exists to strengthen climate resilience in these regions.
Western donor countries mobilized $83.3 billion in 2023 for migration and border management, according to the OECD. Climate adaptation received $1.3 billion in the least developed countries. The 60-to-1 ratio illustrates a preference for repression over prevention.
This approach ignores the reality of climate displacements: they remain predominantly internal and temporary. A study by the Internal Displacement Monitoring Centre shows that 70% of people displaced by natural disasters return home within a year. Investments in reconstruction and local adaptation would be more effective than border control devices.
Sub-Saharan Africa, Laboratory for Sustainable Displacement
Sub-Saharan Africa presents a unique profile: its internal climate displacements last longer and lead more often to permanent migrations. The region counts 1.9 million internal climate displacements in 2024, representing 4% of the global total. But these figures underestimate reality because progressive droughts create diffuse movements, less visible than massive Asian evacuations.
The Sahel illustrates this dynamic. The 2024 drought affected 23 million people according to the United Nations Office for the Coordination of Humanitarian Affairs. Unlike Asian typhoons that trigger temporary evacuations, Sahelian droughts push toward permanent migration. Fulani herders abandon livestock farming for agriculture or cities. Peasants leave degraded lands with no hope of return.
This “slow” migration escapes emergency displacement statistics. A World Food Programme report estimates 12 million Sahelians in “severe food insecurity” who could migrate by 2030. These diffuse movements prepare future migration waves toward Europe.
The contrast with Asia is striking. In the Philippines, 90% of populations evacuated by typhoons return home within six months. In the Sahel, only 30% of herders affected by drought resume their original activities. The difference lies in infrastructure: Asia has early warning systems, evacuation plans, and reconstruction programs. Sub-Saharan Africa lacks these safety nets.
China Normalizes Planned Climate Mobility
China is developing the most advanced model for managing internal climate displacements. Beijing preventively displaced 4.7 million people in 2024, mainly in coastal provinces threatened by typhoons and mountainous regions exposed to landslides.
This planned approach contrasts with the reactive management that prevails elsewhere. Chinese authorities identify at-risk zones, organize temporary evacuation, and finance return or permanent relocation. The “ecological relocation” program has displaced 9.8 million people since 2015, primarily from arid western regions to coastal cities.
Results are compelling: China reduced its natural disaster casualties by 85% between 2015 and 2024, despite intensifying extreme events. The human cost of 2024 typhoons was cut by three compared to 2015, thanks to preventive evacuations and strengthened infrastructure.
This authoritarian model is not exportable as-is, but its methods inspire other Asian countries. Bangladesh has tested “anticipated relocations” in coastal zones since 2023. Vietnam is developing “climate cities” to host populations displaced from the Mekong Delta. These experiments demonstrate that proactive management of climate displacements is possible.
Bangladesh Reinvents Adaptation Through Mobility
Bangladesh transforms its climate vulnerability into a laboratory of social innovation. This country of 170 million inhabitants, caught between rising seas and intensifying cyclones, has developed a unique approach: making internal mobility an adaptation strategy rather than a failure.
The objective is to avoid chaotic rural exodus by organizing it and accompanying transitions with professional training, access to credit, and urban integration. A coastal fisherman can train in mechanics before migrating to Dhaka. A rice farmer can learn industrial sewing before joining Chittagong.
This strategy is bearing fruit: Dhaka absorbs 400,000 new arrivals per year without slum explosion. Urban job creation follows demographic curves. The urban poverty rate has fallen 2.3% per year since 2022, despite the influx of climate migrants.
Bangladesh demonstrates that anticipating climate displacements costs less than enduring them. The government invests 2.1% of its GDP in adaptation, or $8.7 billion over the 2024-2030 period. This amount equals the damage of a major cyclone but prevents decades of reconstruction.
Financing Resilience Rather Than Defense
The gap between adaptation needs and available financing is widening. The United Nations Environment Programme estimates that $387 billion per year is necessary for climate adaptation by 2030. Developed countries mobilized $28.6 billion in 2022.
This shortage hits particularly hard small island states and least developed countries, which concentrate 60% of internal climate displacements per capita. Tuvalu, with its 12,000 inhabitants, has more relative internal displacements than India. But its $63 million GDP limits its adaptation capacity.
The “Loss and Damage” mechanism adopted at COP28 could change the game. This fund, endowed with $700 million, aims to compensate for irreversible climate damage. But its scope remains unclear: does it finance preventive relocation or only confirmed disasters?
Development banks are experimenting with new tools. The World Bank is testing “catastrophe bonds” that trigger automatically in case of extreme events. The African Development Bank is launching “resilience loans” at reduced rates for adaptation. These innovations remain marginal compared to needs.
The European Union could revolutionize the approach by redirecting its migration spending toward source-based adaptation. Investing 15 billion euros in African climate resilience would prevent more migration than the same amount spent on border controls. But this preventive logic struggles to prevail against political urgencies.
The issue transcends development aid: it is about creating alternatives to forced migration. Financing local adaptation would allow populations to stay home by choice rather than leave by necessity. This approach would transform climate mobility into a development lever rather than a destabilization factor.