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.


New Pilot Methodology: Woody Biomass Burial

Woody Biomass Burial is an innovative approach that offers a unique opportunity for large scale, affordable and fully additional carbon removal. The methodology cover activities capable of burying woody biomass under conditions that inhibit biomass decomposition and can maintain those conditions for containment of the stored carbon for at least 100 years. The eligible activity must be net-negative in terms of the overall carbon footprint. Projects registered before 1 December 2023 can be verified according to this pilot methodology.

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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).


Download Biochar Methodology

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.


Download Carbonated Materials Methodology

Bio-based Construction Materials

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 bio-based construction materials from sustainable forestry is a vital carbon removal pathway. By storing CO2 for a minimum of 50 years, bio-based construction materials present an opportunity for companies to invest in carbon capture and storage.

Download Biobased Construction Materials Methodology

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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