If you optimise a planting program for one number — tonnes of CO₂ per hectare per year — you will almost inevitably arrive at the same answer the carbon industry keeps arriving at: vast, fast-growing monocultures of non-native eucalyptus or pine. On paper, the carbon math sings. On the land, something quite different happens.
Eastern Africa has decades of experience with this experiment. Eucalyptus stands that drained wetlands and lowered water tables. Pine blocks beneath which nothing grows and through which nothing moves. Plantations that sequester carbon right up until a single pest, fire, or drought removes the entire stand — and the carbon — at once. A monoculture is not a forest; it is a crop wearing a forest's carbon credentials.
What native species buy you
Native trees grow where they evolved to grow. Acacia abyssinica fixes nitrogen and rebuilds the very soils degraded land has lost. Warburgia ugandensis anchors steep ground and carries medicinal value that gives communities reasons to protect it. Moringa oleifera pairs respectable carbon uptake with leaves and seeds that feed and earn for the household that tends it.
Sequestration in a mixed native stand may start more slowly than in a eucalyptus block — we publish our per-tree estimates openly and conservatively for exactly this reason — but it is resilient carbon. Diverse stands survive the pest that takes one species. They hold through droughts that kill thirstier exotics. They become habitat, fodder, medicine, and shade rather than a silent green monoculture. When you buy a tonne of carbon from a native-species program, you are buying a tonne that is far more likely to still exist in thirty years.
How TreePassport keeps the math honest
Our position is simple: carbon claims should be as verifiable as the trees behind them. Every TreePassport tree is an identified individual of a named species at known coordinates, with a photographic growth history. Our CO₂ figures are estimates calculated per tree, labelled as estimates, and tied to records anyone can inspect — not modelled hectares of hypothetical biomass.
The offset market is slowly learning the difference between fast carbon and real carbon. Native-species restoration, verified tree by tree, is how that difference gets proven. It is slower arithmetic — and it is the only arithmetic the land itself agrees with.