Isometric Announces A New Protocol For Direct Air Capture

Isometric Announces A New Protocol For Direct Air Capture - Carbon Herald

Isometric today published the world’s most comprehensive Protocol for permanent carbon removal via Direct Air Capture (DAC). The Protocol details how DAC technologies—which capture carbon dioxide from ambient air—can be monitored, reported on, and verified so that buyers can purchase DAC carbon credits with confidence.


Isometric protocols set the bar for what project developers need to measure to demonstrate that carbon dioxide has been removed from the atmosphere and safely stored. The DAC Protocol was created in collaboration between Isometric’s in-house Science Team, reviewers from Isometric’s independent network of over 200 scientists, and Isometric’s cross-industry working group.

This working group brought together more than a dozen suppliers, including Montreal-based carbon removal project developer, Deep Sky. As part of Isometric’s commitment to transparency, the Protocol is now undergoing a full public consultation before it can be finalized and used for issuing credits on the Isometric Registry.

Relevant: Isometric Unveils First Bio-oil Geological Storage Protocol For Carbon Removal


Like all Isometric protocols, the DAC Protocol meets the Isometric Standard, which is the world’s most stringent set of rules for carbon removal. This ensures that any carbon credit issued against these protocols represents a genuine tonne of carbon dioxide removed durably from the atmosphere. The scientific processes underpinning each credit are shared on Isometric’s platform so the scientific community and wider public can verify these carbon removals for themselves.


DAC technologies pass ambient air into a structure known as a contactor. Inside this contactor, air is exposed to materials which react with carbon dioxide—such as solid sorbents or liquid solvents. In the contactor, the atmospheric carbon dioxide binds to these materials, while the other components of the air (such as nitrogen and oxygen) pass through back into the air. The captured carbon dioxide is recovered and compressed using heat, pressure, or electro-chemical displacement.

Carbon dioxide is present at relatively diluted concentrations (parts per million) in the atmosphere. This means substantial energy is required to remove and concentrate it. Isometric’s Protocol ensures that energy use for DAC does not lead to secondary emissions through the diversion of renewable energy. The protocol requires direct power purchase agreements (when feasible) and quantifying the procurement of grid energy. This is just one example of how Isometric’s DAC Protocol is the most comprehensive available.

Relevant: Deep Sky Selects Isometric As First MRV Development Partner

Eamon Jubbawy, Isometric founder and CEO, said: “Our new Direct Air Capture Protocol will help ensure DAC credits meet the most rigorous standards. This will help buyers purchase with confidence and ensure the industry can operate and scale effectively.”

The publication of this Protocol follows that of Isometric’s Bio-oil geological storage Protocol last week. Protocols for two other carbon removal methods will be published in the next few months: enhanced rock weathering and ocean alkalinity enhancement. This will bring the total number of published Isometric protocols to four.

The publication of the DAC Protocol, and the others that will follow soon, represents a critical step towards rebuilding trust in carbon markets. This was what Isometric was founded to do. Only then can carbon removal scale to the level that the planet needs to limit – and ultimately reverse – global temperature increases. 

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