Blue Carbon in Cameroon: Atlantic Mangroves as a Carbon Asset

Mangroves are the most carbon-dense forests on the planet. Per hectare, they store two to four times more carbon than terrestrial tropical forests — primarily in their anoxic sediments, where organic carbon can accumulate for centuries without decomposing. For Cameroon, whose Atlantic coastline is bordered by approximately 270,000 hectares of mangroves concentrated around the Wouri, Mungo, and Ndian estuaries, this natural asset represents a largely untapped carbon market opportunity.

The Biology of Mangrove Carbon

Mangrove carbon — also called "blue carbon" — is stored in three compartments: aboveground biomass (trunks, branches, aerial roots), below-ground roots, and sediments. The sediments hold the real potential: under anaerobic (oxygen-free) conditions, organic matter buried in the mud does not decompose. Geochemical analyses of some Cameroonian mangrove sediments reveal carbon stocks of 200–800 tonnes per hectare — far exceeding what a typical terrestrial tropical forest sequesters.

This same property makes mangroves particularly vulnerable to disturbance. When a mangrove is drained, converted to an aquaculture pond, or excavated for salt extraction, the sediments oxidize and release carbon accumulated over centuries. This is precisely the threat of massive carbon release that establishes the additionality of mangrove carbon projects: protecting the ecosystem avoids a potentially catastrophic emission.

Applicable Certification Framework

The primary Verra methodology for coastal blue carbon projects is VM0033 (Tidal Wetland and Seagrass Restoration), supplemented by VM0047 (Afforestation, Reforestation and Revegetation) for mangrove planting on previously deforested areas. These methodologies allow quantification and certification of emission reductions (through protection) and additional sequestration (through restoration).

VCS-certified mangrove projects can obtain the additional CCB label for community and biodiversity co-benefits, and the Coastal Blue Carbon label as a further quality signal for specialized buyers. In 2026, VCS+CCB blue carbon credits from certified mangrove projects in sub-Saharan Africa typically trade at $18–32/tCO2e — a significant premium over comparable terrestrial forest credits.

Cameroon's Mangroves: Characteristics and Threats

Cameroon's mangroves are dominated by four main species: Rhizophora racemosa, Rhizophora harrisonii, Avicennia germinans, and Laguncularia racemosa. The densest formations concentrate in the Wouri estuary (around Douala), the Mungo, the Ndian department in the Southwest, and the Rio del Rey delta.

Documented primary threats include: conversion to aquaculture (particularly shrimp farming in the Ndian), fuelwood extraction by riverside communities, deforestation for village and informal port infrastructure construction, and hydrocarbon pollution from offshore oil activities in the Gulf of Guinea. Remote sensing studies conducted over 2000–2023 indicate a net loss of 8–12% of Cameroonian mangrove cover over this period.

Project Development Opportunities

For project developers, the Ndian delta and mangrove zones in the Southwest region represent the most promising opportunities. These areas combine: documented deforestation threat (demonstrable additionality), high sediment carbon density, the presence of local communities dependent on mangroves for subsistence (community co-benefits), and relative accessibility by sea.

The primary challenge is land tenure. In Cameroon, the maritime domain is legally under state control. Mangroves, while often managed de facto by local coastal communities (Bakweri, Oroko, Bafaw), are not subject to formal land title. A mangrove carbon project must structure a partnership agreement with the state through MINEPDED and obtain carbon development rights within Cameroon's maritime land regulation framework.

A second challenge is the dependence of artisanal fishing communities on mangroves as spawning grounds and fishing areas. Any project that restricts access to mangroves without adequate compensation for local fishers creates social and community risk that can compromise long-term project viability.

Market Premium and Buyer Profile

Blue carbon mangrove credits attract a specific institutional buyer clientele: oil and gas companies seeking to offset offshore emissions, seafood and fishing sector companies with "ocean-positive" commitments, and nature-impact funds focused on coastal marine biodiversity. Large financial institutions joining the TNFD initiative are also a growing outlet for credits with marine biodiversity certification.

For developers positioning on Cameroonian mangroves now, the window of opportunity is real. The international blue carbon credit market remains underdeveloped relative to its potential — particularly in sub-Saharan Africa, where very few mangrove projects have been registered with Verra. Projects reaching maturity in the next three to five years will benefit from a first-mover positioning in a fast-growing market.