Suppliers
A supplier is an organization working to remove carbon dioxide from the atmosphere. This page lists Isometric's suppliers—along with projects that are undergoing or have completed validation—grouped by their carbon dioxide removal (CDR) pathway. For each pathway, Isometric's Science Team develops rigorous protocols that suppliers must follow in order to receive carbon credits.
Listed suppliers
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Biomass Carbon Removal and StorageBiomass Carbon Removal and Storage (BiCRS) involves storing the carbon contained in waste biomass—organic material from living or recently living organisms. BiCRS works by halting or slowing the decomposition of biomass, enabling the carbon it contains to be stored long-term. This can be achieved by converting biomass into materials that decompose more slowly—such as biochar or bio-oil—or by storing it in environments where decomposition is slowed. For BiCRS to count as carbon removal, the biomass must be replenished to ensure additional carbon dioxide is drawn from the atmosphere.
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Enhanced WeatheringEnhanced Weathering (EW) accelerates the Earth's natural chemical weathering process to remove carbon dioxide from the atmosphere. In chemical weathering, carbon dioxide dissolved in rainwater reacts with minerals in rocks, partly dissolving them and producing stable bicarbonate ions. These bicarbonate ions are transported by rivers to the ocean, where they are safely stored for thousands of years. EW is typically carried out by spreading crushed reactive rocks or minerals on croplands.
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MineralizationMineralization encompasses technologies that permanently store carbon dioxide by converting it into stable minerals, such as carbonates, through an accelerated version of the Earth's natural weathering process. This typically involves reacting carbon dioxide with metal oxides—such as magnesium or calcium oxide—to form minerals like calcium carbonate (limestone). Mineralization can occur underground, where carbon dioxide is injected into suitable rock formations; at the surface, where feedstocks such as mine tailings are reacted with carbon dioxide; or in engineered systems. The resulting minerals can then be permanently stored, including in underground geological formations or in the built environment.
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Direct Air CaptureDirect Air Capture (DAC) encompasses technologies that remove carbon dioxide directly from the atmosphere using chemical or electrochemical processes. Typically, in DAC, carbon dioxide in the air binds to either a solid sorbent or a liquid solvent, which then undergoes a regeneration process to release the carbon. The captured carbon dioxide can then be permanently stored using a range of techniques, including deep underground in geological formations.
MarineMarine carbon dioxide removal (mCDR) leverages the ocean's natural capacity to absorb and store carbon for thousands of years. These pathways use the biogeochemical and physical properties of the ocean and other bodies of water to capture carbon dioxide from the atmosphere or to permanently store carbon already contained within them. Approaches to mCDR include Ocean Alkalinity Enhancement and Direct Ocean Capture and Storage.
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ReforestationReforestation removes carbon from the atmosphere by reintroducing or increasing forest cover on degraded land and restoring native forest ecosystems. Forests capture atmospheric carbon dioxide through photosynthesis and store it in biomass, but also release carbon through respiration and oxidation, or due to timber harvesting, fires, and deforestation. Reforestation can include planting tree seedlings, supporting natural regeneration, and managing forests to maximize and preserve the carbon stored in trees.
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