Extreme heat, rising seas, and rapid urbanization could force millions from Coastal West Africa far sooner than expected
LAGOS, Nigeria: On a sweltering afternoon in Lagos, the air feels heavy, and the streets shimmer under the relentless sun.
Vendors wipe sweat from their brows, children seek shade under corrugated roofs, and families pray the power stays on long enough to keep their fans running.
For many here, the heat is not just uncomfortable—it is a warning. Scientists now say that by 2050, and almost certainly by 2070, parts of Coastal West Africa could become uninhabitable, forcing millions to abandon the homes they have known for generations.
The science behind the warning is chilling. When wet bulb temperatures—a measure of heat and humidity—reach 35°C (95°F), the human body can no longer cool itself.
Survival becomes impossible beyond a few hours. Already, regions in South Asia and the Persian Gulf have crossed this threshold.
Now, projections show that West Africa’s coastline, from Senegal to Nigeria, could join them within decades.
For residents, the danger is not abstract. “We already struggle with the heat,” says Mariam, a mother of three in Accra. “When the power goes out, we have no fans, no relief.
If it gets worse, how will we survive?” Her words echo across communities where energy poverty leaves millions without access to cooling infrastructure.
The threat extends beyond heat. Rising seas are swallowing villages along the coast. Fishermen in Abidjan describe saltwater creeping into farmland, destroying crops and livelihoods.
In Lagos, where the population is expected to surpass 30 million by mid-century, unplanned urban growth has created sprawling settlements vulnerable to floods and heatwaves. “We are building faster than we can protect ourselves,” admits a local planner.
Socioeconomic pressures deepen the crisis. A recent Nature study warns that unchecked industrial expansion and resource exploitation may pose an even greater hazard than sea-level rise itself.
Without coordinated planning, economic growth could accelerate environmental degradation, leaving the region even more exposed.
The human consequences are staggering. In 2024 alone, 45.8 million people worldwide were displaced by climate disasters.
Experts fear West Africa could become a major source of migration, destabilising economies and societies across the continent. “If people cannot live here, they will move,” says Dr Adebayo, a climate researcher in Lagos. “But where will they go?”
Globally, the crisis is unfolding in parallel. South Asia has already endured deadly wet bulb events. Eastern China saw 26 days above 35°C in August 2024. In Brazil, deforestation is driving extreme heat stress. Even the United States, particularly Arizona and Florida, faces overlapping risks of heat, drought, and wildfires.
The Intergovernmental Panel on Climate Change warns that a 1.5°C rise could quadruple extreme heat events by century’s end.
For Coastal West Africa, this means a future where heat-related deaths become common, flooding displaces millions, and urban centres buckle under pressure.
International initiatives like the West African Coastal Areas Program (WACA) are working to build resilience, but experts caution that without urgent action, the region could face mass migration and destabilisation.
For Mariam in Accra, the science is not a distant forecast—it is a lived reality. “We don’t need reports to tell us the heat is worse,” she says, wiping sweat from her brow.
“We feel it every day. If this is only the beginning, then the future is frightening.”
The bottom line is stark: Coastal West Africa stands at the frontline of the climate crisis. By 2050—and certainly by 2070—the combination of extreme heat, rising seas, and rapid urbanisation could render parts of the region uninhabitable.
The choices made today—on infrastructure, adaptation, and global emissions—will determine whether millions can continue to call this coastline home.