Enhanced weathering has been the CDR pathway with the widest gap between theoretical potential and commercial deployment. That gap just got smaller.
Mombak, the Brazilian carbon removal developer, has generated its first Isometric-verified enhanced weathering credits. Rock dust applied to working agricultural land in Brazil, monitored and verified by one of the most rigorous third-party certification bodies in the CDR market.
Why Brazil Is the Right Place for EW
The science of enhanced weathering favors tropical conditions. High temperatures accelerate mineral dissolution rates. Heavy rainfall drives the chemical reactions that convert silicate minerals into dissolved bicarbonate, which eventually reaches the ocean and stores carbon as alkalinity. Acidic tropical soils provide the low-pH environment where weathering reactions proceed fastest.
Brazil checks every box. The country has abundant agricultural land where rock dust can be co-deployed with existing farming operations. Domestic basalt supply chains already exist for agricultural liming. And tropical soils consistently outperform temperate equivalents in weathering rate studies.
CDI’s own greenhouse research with 400+ lysimeters confirms this pattern: soil type determines everything when it comes to EW performance. Acidic soils deliver measurable cation release within months. High-pH soils hit saturation quickly and produce minimal CDR signal.
The MRV Question
Verification has been the bottleneck. Enhanced weathering generates carbon removal through a slow geochemical process spread across large land areas. Measuring it requires tracking dissolved cation concentrations in soil water, alkalinity export through drainage, and soil carbon changes over time. It is inherently harder to verify than point-source capture methods like DAC, where you can meter the CO₂ coming out of a pipe.
Isometric has built its reputation on applying scientific rigor to exactly this kind of challenge. Their verification framework for EW incorporates multi-pool monitoring: soil solution chemistry, cation export measurements, and conservative accounting that acknowledges the cation retention problem that CDI has documented extensively.
In year one of most EW deployments, 10-50x more cations are retained in soil than exported as alkalinity. This means naive measurement approaches that only track alkalinity export will underestimate total weathering activity, while approaches that assume all released cations contribute to CDR will overestimate actual removal. Isometric’s framework navigates this by using conservative bounds.
What Commercial Credit Issuance Means
The transition from “pilot project with promising data” to “verified credits available for purchase” is the step that unlocks capital. Corporate buyers building CDR portfolios need credits they can retire against their climate commitments with confidence that the underlying removal is real.
Mombak is also registering reforestation projects with Isometric, building a diversified CDR portfolio across multiple pathways. The strategy mirrors what we are seeing from buyers like Mercedes-AMG PETRONAS F1, who are diversifying across 6+ technologies to manage delivery risk.
For the enhanced weathering field specifically, this is a signal that the pathway is crossing from research into commerce. Not everywhere, not at gigatonne scale yet, but in the geographies and soil types where the science is strongest.
For a deeper look at how CDI’s Everest project is measuring EW in real time, see the CDI portfolio spotlight on Everest.
Source: Carbon Herald, April 2026.