Ronnie Paul is a seasoned writer and analyst with a prolific portfolio of over 100 published articles, specialising in climate change at Africa Digest News.
There is no legal term “climate refugee” in international law, yet the Internal Displacement Monitoring Centre (IDMC) counted a record 45.8 million climate-displaced people in 2024 alone, nearly double the annual average of the past decade, with weather-related events triggering 99.5% of these movements.
As of the end of 2024, 9.8 million remained displaced due to disasters, up from 7.7 million the prior year, amid escalating cyclones, floods, and droughts intensified by climate change.
These figures underscore a growing crisis: people fleeing uninhabitable homes, only to face rejection at borders that wealthy nations are fortifying even as their own citizens begin to move.
The Numbers: Slow-Onset vs. Sudden Disasters
Climate displacement divides into two broad categories: sudden-onset events like floods and storms, which force rapid evacuations, and slow-onset processes like sea-level rise and desertification, which erode livelihoods over years.
In 2024, sudden disasters dominated, triggering 45.8 million internal displacements globally. Storms and floods alone accounted for over 90% of weather-related movements, per IDMC data.
The U.S. led with 11 million disaster displacements, nearly a quarter of the global total, driven by Hurricanes Helene and Milton.
Slow-onset threats, however, are stealthier and more pervasive. The World Bank estimates that by 2050, up to 216 million people could become internal climate migrants, with slow processes like desertification in sub-Saharan Africa (projected 86 million) and sea-level rise in South Asia (up to 19.9 million in Bangladesh alone) displacing far more than sudden events.
Unlike acute disasters, where most return home (e.g., 95% of 2024’s U.S. displacements were temporary), slow-onset forces cause permanent relocation: over the past decade, weather hazards drove 218 million internal displacements, but cumulative effects like land loss leave millions stranded.
In Central America, droughts in the Dry Corridor have already displaced thousands annually, blending with sudden floods to create “compound” crises.
These numbers reveal a tipping point: without adaptation, the UN projects 1.2 billion at risk by 2050, with slow onset amplifying vulnerability in data-poor regions.
Pacific Island Relocations, Central American “Drought Migrants,” Bangladesh’s Disappearing Chars
Real-world cases illustrate the human toll, where entire communities face existential threats.
Pacific Island Relocations
Low-lying atolls are vanishing under rising seas, prompting planned evacuations. In Fiji, Vunidogoloa village relocated inland in 2014 after erosion claimed 15 metres of coastline in 30 years; by 2025, 42 more villages are queued for similar moves under the National Planned Relocation Guidelines.
Solomon Islands’ Walande community abandoned their submerged island in the 2020s, resettling on Malaita.
Amid ongoing breaches of protective seawalls, per a 2025 Human Rights Watch report, inadequate support has compounded food insecurity.
Tuvalu and Kiribati, facing 20-30 cm annual inundations, are negotiating “migration with dignity” pacts: Tuvalu bought Fijian land for relocation, while New Zealand’s 2023 visa pathway offers 250 annual spots for Tuvaluans.
Yet, cultural loss haunts these moves. Amnesty International’s 2025 report on Tuvalu-Kiribati migration to New Zealand highlights “navigating injustice,” with restrictive policies failing to honour rights to identity and self-determination.
Central American “Drought Migrants”
The Dry Corridor spanning Guatemala, Honduras, El Salvador, and Nicaragua has endured five failed rainy seasons since 2020, the worst in 40 years.
By 2025, over 7.1 million face acute food insecurity, with droughts displacing 2-3 million annually, per FAO estimates.
In Honduras, 360,000 refugees and migrants transited the southeastern border in 2024 alone, many fleeing crop failures that wiped out 82% of maize in 2018 and persist amid erratic El Niño patterns.
A 2023 Climatic Change study links these “drought migrants” to U.S. border surges: dry seasons predicted 70% higher emigration from 2012 to 2018, a trend holding into 2025.
IOM reports compound risks: droughts followed by floods like those from Hurricanes Eta and Iota (2020) have displaced 1.7 million, pushing families northward in “mixed migration” flows blending climate, violence, and poverty.
Bangladesh’s Disappearing Chars
Riverine chars are ephemeral islands in the Brahmaputra and Ganges that housing 4-5% of Bangladesh’s population but erode at alarming rates, displacing 110,000 yearly.
In 2025, IDMC reported 18.5% of Khulna region’s displacements from climate disasters, up from 16.5% in 2021, as chars like those in Kurigram vanish overnight from glacier-melt-fuelled floods.
Over 7.1 million were displaced in 2022 alone, per WHO; by 2050, 13.3 million could migrate internally under pessimistic scenarios.
A 2025 Reuters investigation in Kurigram detailed families like Habibur Rahman’s rebuilding futilely as monsoons, now erratic and intense, claim homes; riverbank erosion alone displaces 1 million annually.
Oxfam’s Loss and Damage Dashboard logged 11,500 incidents in 19 districts from 2023 to 2024, totalling $17 million in losses, with non-economic harms like trauma dominating.
These hotspots show displacement as a symptom of inequity: low-emission nations bear the brunt.
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Why the 1951 Refugee Convention Doesn’t Protect Them
The 1951 Refugee Convention and 1967 Protocol define refugees as those fleeing “persecution” on grounds of race, religion, nationality, social group, or political opinion criteria, excluding environmental drivers.
As UNHCR notes, it was crafted for post-WWII Europe, not climate crises; “climate refugees” lack legal standing, leaving cross-border movers as “economic migrants” ineligible for asylum.
Progressive interpretations, like New Zealand’s 2013 Teitiota case (rejecting sea-level rise claims) or the EU’s non-binding compacts, offer no binding rights.
A 2020 UN Human Rights Committee opinion barred deporting a Kiribati man to climate peril, invoking non-refoulement, but it’s advisory. Calls for a protocol persist.
UN Special Rapporteur Ian Fry urged one in 2023, yet the Convention’s narrow scope persists, trapping most in internal limbo without protections.
Countries Tightening Borders Even as Their Own Citizens Start Moving
Wealthy nations fortify against inflows while ignoring domestic outflows. The U.S. tripled its deportation force in 2025, allocating $46.6 billion for walls and $45 billion for detention.
ICE now rivals the FBI despite 11 million internal disaster displacements in 2024. Florida’s uninsured coast exemplifies irony: post-Helene/Milton, 36% of residents considered moving due to hazards (FAU 2025 survey), with Miami-Dade projecting thousands fleeing sea rise by 2100; yet federal policies like JD Vance’s 10% remittance tax hinder Central American migrants who bolster resilience via $250/capita flows.
The EU doubled border budgets to €25.2 billion (2028-34), deporting 110,000 in 2024 while paying Tunisia to block Mediterranean crossings.
Frontex funding triples amid 1.2 billion at risk by 2050 (IEP). The UK eyes harsher asylum rules, deporting failures despite its emissions legacy.
As Princeton models show, tight borders exacerbate vulnerability: remittances fund adaptation, but restrictions trap 216 million in peril (World Bank).
Even Florida sees “demographic amplification”: young workers flee coasts, ageing retirees stay, straining services.
