Blue Carbon in West Africa: A Coastal Opportunity Worth Billions

Coastal and marine ecosystems — mangroves, seagrass beds, tidal marshes, and macroalgae — sequester carbon at rates per hectare ten to forty times higher than tropical forests, and store it in waterlogged sediments for millennia rather than decades. These "blue carbon" systems are among the most powerful natural climate solutions available, and West Africa has some of the world's most extensive and ecologically intact examples.

The West African coastline from Senegal to Nigeria encompasses over 1.2 million hectares of mangrove — roughly 10% of the world's total. Mangroves in the Niger Delta alone contain above- and below-ground carbon stocks estimated at over 1 billion tonnes of CO2 equivalent. Yet deforestation rates in this region remain among the highest globally, driven by charcoal demand, aquaculture expansion, and coastal development.

Conservation finance through voluntary carbon markets and emerging biodiversity credit mechanisms offers a compelling opportunity to change these dynamics. CLEEN's modelling, based on site-level data from pilot projects in Ghana, Senegal, and Nigeria, estimates that a credibly verified blue-carbon programme across the region's top-priority mangrove sites could generate between USD 400 million and USD 1.2 billion in cumulative revenue over a 30-year project lifetime.

Capturing this opportunity requires addressing several preconditions. Land tenure and water-use rights in coastal zones are often contested or unclear, creating legal risk that deters investors. Community consultation and benefit-sharing must be genuine and well-documented to meet Gold Standard and VCS requirements, and to maintain long-term stewardship commitment. And Annex I parties must provide additional market guidance on how blue-carbon credits interact with nationally determined contributions under Article 6.

CLEEN is currently supporting blue-carbon programmes in three West African countries and contributing to regional technical guidance through the UNEP mangrove initiative. The opportunity is real, the science is robust — what is needed now is coordinated investment in project development and capacity building at regional scale.