The science behind Project Nimbus

Project Nimbus combines dynamic baselines, comprehensive measurement, conservative carbon accounting, and independent verification to ensure every credit represents real, additional climate impact.

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Use the following as expandable accordions so the technical depth remains available without overwhelming the primary project narrative.

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Additionality

Project Nimbus uses a six-step additionality test, anchored by a negative NPV test for every timber stand.

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The six-step test requires:

• Landowners to participate voluntarily

• Proof of ownership, timbering rights, and historical timber harvesting

• Contractual attestations to the additionality of the project

• Financial penalties for failure to remove carbon

• Satisfaction of the minimum activity period

• A negative NPV test for every individual timber stand

The negative NPV test is the anchor of additionality. It demonstrates that, without carbon financing, participating in the project would be economically unfavorable compared with the baseline scenario.

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Project Nimbus strengthens this test with a dynamic baseline that uses current data, including timber prices, tree maturity, market access, and other variables, to model each landowner's economic reality.

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This helps ensure credits come from forests genuinely at risk of harvest rather than relying on static historical assumptions.

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Carbon Quantification

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Project Nimbus combines ground-sourced forest measurements with LiDAR, aerial imagery, satellite data, and other remotely sensed information to comprehensively measure the project.

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Every hectare is measured, generating more than 37,000 data points per hectare. Greater accuracy and reduced uncertainty help limit the risk of over-crediting and give buyers greater confidence in the climate impact represented by each credit.

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Independent third parties collect the underlying plot and remotely sensed data. An independent verifier audits the project's data, calculations, and outcomes, including on-site reconciliation of plot data.

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The carbon quantification team includes experts in biostatistics, geomatics, silviculture, and data science, with more than half of the team holding PhDs.

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Durability

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Project Nimbus accounts for durability before credits are issued.

Rather than relying on a promise that carbon will remain stored for decades into the future, Project Nimbus takes a durability deduction to account for unmitigated emissions remaining after the project.

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The project further addresses potential reversals by conservatively assuming reversals will occur and accounting for them before issuance.

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This eliminates dependence on buffer pools and eliminates technical reversal risk after issuance.

• Impact first. Credit second.

• Durability accounted for before issuance

• Reversals accounted for before issuance

• No dependence on buffer pools

• No reversal risk after issuance

The result: no reversal risk for 1,000+ years.

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Leakage

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Project Nimbus accounts for both market-based and activity-shifting leakage in accordance with the project methodology.

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To prevent activity-shifting leakage, participating landowners are required to enroll all properties they own or manage in the project.

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Sky Harvest combines contractual attestations from landowners with verification of property rights and ownership to ensure harvesting activity isn't simply shifted from enrolled forests to other properties.

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While market-based leakage is conservatively deducted on a stand-by-stand basis, averaging a ~30% project-wide deduction.

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Co-benefits

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Project Nimbus creates measurable benefits beyond carbon removal.

The project preserves approximately 7,500 hectares of watershed annually, supporting the protection of water-related ecosystems.

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It protects 74 native tree species across more than 3.4 million trees, supporting forest health and biodiversity.

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Project Nimbus also works exclusively with small and underserved landowners, creating new income streams while supporting rural economic development.

Broadly, the project tracks 12 targets across six U.N. Sustainable Development Goals, including benefits related to water, biodiversity, economic development, and sustainable land management.

Project Nimbus creates measurable benefits beyond carbon removal.

The project:

• Preserves approximately 7,500 hectares of watershed annually

• Protects 74 native tree species across more than 3.4 million trees

• Protects habitat for wild turkeys, deer, hogs, raccoons, birds, and foxes, photographed on-site

• Works exclusively with small and underserved landowners

• Creates new income streams for participating landowners

• Supports rural economic development

• Creates new forestry and technical jobs

• Supports greater ecosystem resilience

• Tracks 12 targets across six U.N. Sustainable Development Goals