Carbon Removal Methods CO2 Removal Certificates (CORCs) are based on Puro Standard's science-based quantification methodologies for carbon removal.

The Puro Standard for carbon removal is used to issue science-based certificates that represent actual carbon that has been removed from the atmosphere. Our verification process requires scientific measurement and quantification of the removed carbon in the product or process and carbon net-negativity in its production, from cradle-to-gate.

At the moment, we issue CO2 Removal Certificates (CORCs) for three carbon removal methods that have significant volume potential and where costs are reasonable. Additionally, we have co-created a first-of-its kind Geologically Stored Carbon methodology that will begin to get CORCs soon.


How to buy CORCs


A very stable, solid form of carbon that can endure in soil for thousands of years, making it an ideal technology for scalable carbon removal.

It has multiple commercial uses at potentially industrial volumes, for example, as greenhouse additive, in soil regeneration and in wastewater treatment. It is produced from biomass or biowaste, through pyrolysis (heated in the absence of oxygen).


Buy carbon removals from biochar

Carbonated Building Elements

Manufactured concrete-like building elements from steel slag (waste material from steel industry) instead of traditional cement. Basically, it’s CO2 negative concrete that removes more CO2 than its production emits.

During the hardening phase CO2 is chemically bound and mineralised permanently into the building element. Benefits of the method include easy measurability and storage of CO2 for good.


Wooden Building Elements

Growing trees continously capture carbon but the carbon may go back to circulation if the trees burn, decompose or are used for paper or energy. 

In Europe, buildings are regulated to have a minimum lifetime of 50 years, and in real life the CO2 storage is likely to be longer. The cycle of making wooden building elements from sustainable forestry is a vital carbon removal pathway. By storing CO2 for a minimum of 50 years, wooden building elements present an opportunity for companies to invest in carbon capture and storage.

Buy carbon removals from wooden building elements

Geologically Stored Carbon

Carbon capture processes such as DACCS, BECCS and Bio-CCS combined with geological storage, such as direct injection of CO2 into deep geological formations and oil and gas reservoirs as part of EOR+, offer a permanent carbon removal pathway.'s Geologically Stored Carbon methodology does not cover capturing CO2 from fossil fuels, only from biogenic sources.

A methodology provides procedures to verify the compliance of CO2 removal activity with the removal method. It specifies the system boundaries, detailed calculation formulas and the proof needed for the issuance of CORCs from each removal method. Download's Rules and Methodologies.

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