In a recent study published in the journal Waste Management Bulletin, lead author Kassé Jean Hugues Angbé and his research team from the DBFZ Deutsches Biomasseforschungszentrum and the University of Rostock present a compelling case for a circular economy in West Africa. The study provides the first comprehensive assessment of cocoa pod husk generation across seven major producing nations: Côte d’Ivoire, Ghana, Nigeria, Sierra Leone, Liberia, Guinea, and Togo. While West Africa is the global leader in cocoa production, accounting for approximately 70 percent of the world’s supply, the industry currently faces a massive waste management crisis. Most of the cocoa pod husks, which make up nearly three-quarters of the fruit’s weight, are simply abandoned on farms to decompose. This research highlights that transforming this underutilized byproduct into biochar offers a dual solution for environmental sustainability and agricultural resilience.

The results of the 20-year assessment are staggering, revealing that these seven countries have collectively produced 578 million tonnes of cocoa pod husks. Côte d’Ivoire alone contributed more than half of this total, followed by Ghana and Nigeria. Currently, the predominant practice of leaving these husks to rot in the field has severe environmental consequences. The decomposition process emits roughly 17 million tonnes of carbon dioxide equivalent annually, which accounts for about 3 percent of all agricultural methane emissions across the entire African continent. Furthermore, these piles of waste create breeding grounds for pathogens like black pod disease, which can devastate cocoa yields by as much as 30 percent.

The study proposes a transition to on-farm biochar production using simple, low-cost equipment like the Kon-Tiki flame curtain kiln. The findings indicate that the region has an annual production potential of 869 thousand tonnes of cocoa pod husk biochar. This approach is particularly effective because biochar is a highly stable form of carbon that can remain in the soil for hundreds or even thousands of years. By adopting this valorization strategy, the West African cocoa sector could reduce its greenhouse gas footprint by more than 18 million tonnes of carbon dioxide equivalent each year. This total includes both the methane emissions avoided by stopping natural decay and the carbon actively sequestered when the biochar is applied back to the soil.

Beyond the climate benefits, the researchers found that biochar serves as a powerful tool for soil restoration in a region where land degradation is a significant concern. Because of its porous structure, biochar improves water and nutrient retention, making cocoa farms more resilient to the impacts of water stress and erratic rainfall. The potential annual biochar supply could amend between 43 and 174 million hectares of farmland, providing a sustainable alternative to expensive chemical fertilizers. Survey data included in the study shows that over 90 percent of local farmers are willing to adopt biochar as a soil amendmentA soil amendment is any material added to the soil to enhance its physical or chemical properties, improving its suitability for plant growth. Biochar is considered a soil amendment as it can improve soil structure, water retention, nutrient availability, and microbial activity.   More, provided they receive the necessary training and capacity building.

To realize these benefits, the report recommends that national boards like the Ghana Cocoa Board and Côte d’Ivoire’s Café-Cacao Council establish formal biochar standards and integrate these practices into national climate targets. Creating carbon credit mechanisms could also provide farmers with a new source of income by monetizing the carbon sequestration benefits of their work. By moving from a model of waste disposal to one of value creation, West Africa can protect its economic dependence on cocoa while leading the way in climate-smart agriculture. This research confirms that cocoa pod husks are not just a byproduct, but a strategic resource that could fundamentally transform the environmental profile of the global chocolate industry.

Source: Angbé, K. J. H., Krüger, D., Lenz, V., & Narra, S. (2026). Harnessing cocoa waste for biochar production and emission reduction to promote sustainability in West Africa. Waste Management Bulletin, 4, 100282