West Africa is one of the most climate-vulnerable regions on Earth. Average temperatures have risen by 1.5°C since pre-industrial levels — faster than the global mean — and climate projections consistently place the region among those facing the most severe increases in drought frequency, rainfall variability, and extreme heat events. Yet West Africa's contribution to global greenhouse gas emissions is less than 3%.
The Vulnerability Landscape
Climate vulnerability in West Africa is not uniform. Coastal communities face accelerating sea-level rise and saltwater intrusion. Inland Sahel communities contend with a shifting rain belt compressing the agricultural calendar and expanding desertification. Communities in forest-transition zones face a feedback loop between land-use and precipitation as forests are cleared. These three vulnerability profiles require different adaptation responses, and one persistent failure of international climate finance is treating "West Africa" as a homogeneous unit.
Indigenous Knowledge as Adaptation Infrastructure
A significant finding from our five-year field research programme across Ghana, Burkina Faso, and Senegal is the extent to which traditional ecological knowledge systems already encode sophisticated climate adaptation strategies. Zaï farming, a traditional water-harvesting technique developed by Mossi farmers in Burkina Faso, involves digging small pits to concentrate water and organic matter around individual plants. In controlled trials, zaï fields showed 40–80% higher millet yields during drought years. The technique requires no external inputs, is entirely locally reproducible, and has been practised for centuries. Yet it remains largely absent from national agricultural extension programmes.
Ecosystem Services Valuation
A central challenge in climate adaptation policy is that many of the most valuable ecosystem services — carbon sequestration, water regulation, biodiversity — have no market price. Decision-makers allocating land between forest conservation and agricultural expansion therefore systematically undervalue forest. Our research applied ecosystem services valuation to forest-transition communities in the Volta River Basin. Preliminary estimates suggest that intact riparian forests provide water regulation services worth approximately $340 per hectare per year to downstream communities — a value entirely absent from land-use planning calculations.
Climate Finance: The Access Deficit
Global climate finance flows reached a record $1.3 trillion in 2023. West Africa received less than 2% of this total. The gap reflects structural barriers: complex application procedures, co-financing requirements that cash-constrained governments cannot meet, and a preference for large infrastructure projects over community-scale interventions where evidence is strongest. The Adaptation Fund's Direct Access modality represents a promising alternative, allowing national institutions to access finance directly. Scaling these institutional pathways is as important as scaling the finance itself.
Conclusion
West Africa does not need to wait for global emissions reductions to build climate resilience. The knowledge, community capacity, and institutional frameworks exist. What is missing is sustained research investment, meaningful inclusion of African scientists in global climate governance, and finance mechanisms that reach the community level where adaptation is actually practised.
