DRC: Urban trees are natural CO₂ stores that merit closer attention

In the Democratic Republic of the Congo (DRC), urban trees are increasingly being recognized as vital components of the solution to climate change. Traditionally overlooked in favor of old-growth forests, these trees in cities like Bunia have been found to play a significant role in carbon sequestration, according to a recent study conducted in the Ituri Province.

The study, published in October 2025, highlights the importance of urban trees as natural carbon sinks, capable of offsetting substantial portions of human-related carbon dioxide (CO₂) emissions. This realization has sparked renewed interest among scientists in the DRC and beyond, as cities have largely been absent from climate policies due to a lack of reliable data on their carbon-storing potential.

To address this gap, researchers from the University of Bunia conducted an inventory of 2,311 trees across 21 one-hectare plots in three communes of Bunia: Mbunya, Nyakasanza, and Shari. Employing non-destructive methods that relied on tree diameter, height, and wood density, the team estimated the aboveground biomass and carbon stock without needing to fell any trees.

The findings were striking. The urban trees in Bunia were found to store 1,759 tons of aboveground biomass, translating to 8,795 tons of carbon sequestered. This equates to the removal of 2,374 tons of CO₂ from the atmosphere. On average, each urban tree in Bunia stores 380 kilograms of carbon, which is equivalent to approximately 124 kg of CO₂ absorbed. In one urban hectare, the average carbon stock is 47.6 tons.

These figures demonstrate the significant potential of urban trees in mitigating climate change. While natural forests have long been recognized for their role in carbon absorption, the contribution of urban trees has often been underestimated. The Bunia study underscores the need for more research and policy development to integrate these green spaces into broader conservation efforts.

The recognition of urban trees as carbon sinks is particularly relevant in the context of rapidly urbanizing African cities. As infrastructure projects like the modern airport planned for Bunia continue to expand, there is an opportunity to prioritize green spaces and integrate them into urban planning. By doing so, cities can not only enhance their livability but also contribute meaningfully to global efforts to reduce CO₂ emissions.

The study from the University of Bunia serves as a valuable starting point for further exploration into the carbon sequestration potential of urban trees across the DRC and beyond. As climate change remains a pressing global challenge, every tool in the toolbox—including the seemingly humble urban tree—must be leveraged to make a difference. The findings from Bunia highlight the importance of reevaluating our approach to urban green spaces and recognizing their role as natural allies in the fight against climate change.