Our portfolio

We work with a multidisciplinary group of top scientific experts to help us evaluate the most promising carbon removal technologies. Explore our growing portfolio of projects, read the criteria we use to select them, or view our open sourced project applications.

AspiraDAC

AspiraDAC is building a modular, solar-powered direct air capture system with the energy supply integrated into the modules. Their metal-organic framework sorbent has low temperature heat requirements and a path to cheap material costs, and their modular approach allows them to experiment with a more distributed scale-up.

Track
Prepurchase
Based in
Sydney, Australia
Tons
500
Pathway
Direct air capture

Calcite-Origen

This project, a collaboration between 8 Rivers and Origen, accelerates the natural process of carbon mineralization by contacting highly reactive slaked lime with ambient air to capture CO₂. The resulting carbonate minerals are calcined to create a concentrated CO₂ stream for geologic storage, and then looped continuously. The inexpensive materials and fast cycle time make this a promising approach to affordable capture at scale.

Track
Prepurchase
Based in
US and UK
Tons
278
Pathway
Direct air capture

Lithos

Mineral weathering already naturally captures CO₂ at gigaton scale. Lithos accelerates this by spreading basalt on croplands to increase dissolved inorganic carbon in the soil. Their technology uses novel soil models and machine learning to maximize CO₂ removal while boosting crop growth. The team is scaling their empirical verification, river network, and plant-tissue studies to advance measurement of CO₂ drawdown and ecosystem impact.

Track
Prepurchase
Based in
Seattle, US
Tons
640
Pathway
Enhanced weathering

RepAir

RepAir uses clean electricity to capture CO₂ from the air using a novel electrochemical cell and partners with Carbfix to inject and mineralize the CO₂ underground. The demonstrated energy efficiency of RepAir’s capture step is already notable and continues to advance. This approach has the potential to deliver low-cost carbon removal that minimizes added strain to the electric grid.

Track
Prepurchase
Based in
Tel Aviv, Israel
Tons
199
Pathway
Direct air capture

Travertine

Travertine is re-engineering chemical production for carbon removal. Using electrochemistry, Travertine produces sulfuric acid to accelerate the weathering of ultramafic mine tailings, releasing reactive elements that convert carbon dioxide from the air into carbonate minerals that are stable on geologic timescales. Their process turns mining waste into a source of carbon removal as well as raw materials for other clean transition technologies such as batteries.

Track
Prepurchase
Based in
Boulder, US
Tons
365
Pathway
Enhanced weathering

Living Carbon

Living Carbon wants to engineer algae to rapidly produce sporopollenin, a highly durable biopolymer which can then be dried, harvested and stored. Initial research aims to better understand the field’s thinking on the durability of sporopollenin as well as the optimal algae strain to quickly produce it. Applying synthetic biology tools to engineer natural systems for improved and durable carbon capture has the potential to be a low-cost and scalable removal pathway.

Track
Prepurchase
Based in
San Francisco, US
Tons
R&D grant
Pathway
Synthetic biology

Our selection process

Each project submits an application, which is then reviewed by a panel of scientific, commercial, and governance experts. We assess projects against our target purchase criteria.

As the diversity of carbon removal approaches increases and various pathways mature, we’ll continue to iterate our selection process to best reflect that.

Multiple funding tracks

To support technologies at different stages in their development, we purchase carbon removal through two funding tracks.

1 | Prepurchase

For early-stage suppliers piloting new technologies, Frontier offers low-volume prepurchase agreements to accelerate development.

2 | Offtake

For larger suppliers preparing to scale, Frontier facilitates offtake agreements to purchase future tons of carbon removal at an agreed price if and when delivered. This purchase track will make up the bulk of Frontier’s spend.

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