Isometric Certifies First Amazon Credits From Mombak

Isometric has issued its first nature-based carbon credits, certifying 21,771 reforestation credits from Mombak's Amazon project. The milestone matters less for the trees themselves and more for what it proves. Isometric's dynamic baseline methodology can now stand up to real-world scrutiny, not just theoretical review.

The credits come from Reforesting the Brazilian Amazon Project 1, Mombak's flagship native-species reforestation effort. They mark Isometric's first certification under its Reforestation Protocol. That framework won Core Carbon Principles approval from the ICVCM in February 2026.

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What did Isometric actually certify?

Isometric certified 21,771 tonnes of carbon removal from native-species trees planted under Mombak's Amazon reforestation program. The credits were issued through Certify, Isometric's automated certification platform. Every calculation behind them is published on the public registry.

This is Isometric's first nature-based certification of any kind. The company built its reputation on verified enhanced weathering credits, where sensors and lab analysis dominate. Forestry runs on messier variables: tree growth rates, soil carbon, and decades of monitoring. Passing that test is a different proof point than certifying a rock-weathering batch.

Mombak is a Brazil-based carbon removal company working to reforest degraded Amazon land with native species instead of fast-growing monoculture. The company has now listed both engineered and nature-based projects on the Isometric Registry, a combination few suppliers can claim.

How does the Reforestation Protocol solve forestry's trust problem?

Isometric's protocol sets baselines independently. Suppliers don't define their own baselines, which removes a conflict of interest that has dogged legacy forest carbon programs for years. That approach mirrors the dynamic baseline credits model gaining traction elsewhere in forestry carbon. Isometric also handles ongoing monitoring itself, rather than leaving it to the project developer.

Eamon Jubbawy, CEO of Isometric, has been blunt about why forest carbon needed a rebuild.

The protocol layers in three checks that most forestry frameworks skip. Dynamic baselines adjust to real conditions on the ground instead of locked-in projections. Albedo accounting factors in how much sunlight the forest canopy reflects. And credits require verified native-species plantings, not fast-growing commercial timber.

Every credit carries a minimum durability window of 40 years, with monitoring tied to that period. monthly credit deliveries are already standard on Isometric's engineered side. The registry wants that same rigor applied to trees.

Dan Harburg, Mombak's Chief Product Officer, explained the decision to bring reforestation credits to Isometric when the partnership was first announced earlier this year.

Which US companies are watching this milestone?

Google, McKinsey and Microsoft have all signed offtake deals with Mombak. Those agreements sit within more than $170 million in contracted revenue Mombak has secured across its carbon removal work.

The Symbiosis Coalition is a US buyers' club focused on high-quality nature-based removals. It selected Mombak's Amazon project as the first pick under its inaugural request for proposals. Coalition members have purchased 215,000 tonnes from the project to date.

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For US buyers building CDR portfolios, the appeal isn't the trees. It's the paper trail. Buyers want the same expanded CCS methodology style of transparency across every pathway, engineered or nature-based. That kind of public, auditable proof is also what smaller platforms like public registry traceability tools are now offering to individual buyers.

Milestone	Date	Pathway	Credits Issued
First Mombak credits, Project Cajueiro	April 2026	Enhanced Weathering	46
Reforestation Protocol wins CCP label	February 2026	Reforestation (framework)	N/A
First nature-based certification, Project 1	July 2026	Reforestation	21,771

Is Isometric a US registry?

No. Isometric is headquartered in London, with a second office in New York. That dual presence matters for North American buyers. It gives Isometric a direct commercial footprint in the US market, where most of Mombak's offtake demand originates.

Isometric's registry now spans engineered pathways, including the ones covered in direct air capture scale-up coverage. It also spans geologic storage projects like those tracked in carbon storage milestone reporting. Nature-based credits are the newest addition, and the newest test of whether that rigor travels across pathways.

The broader market has been pushing toward this cross-pathway consistency for a while. That trend shows up in recent carbon removal credit transactions data. Buyers increasingly favor registries with a track record over registries built on promises.

The reforestation market has spent years fighting a credibility problem built on estimates that never matched reality. This issuance doesn't erase that history. It gives buyers one registry, covering trees and technology alike, where they can check the math themselves.

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