Carbon Removal Methods

Puro.earth 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.

Methodologies

Biochar

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).

 

Biochar

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Carbonated Building Materials

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.

 Carbonated Building Elements

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New Methodology: Enhanced Rock Weathering

Enhanced rock weathering is a process that aims to accelerate natural rock weathering where carbon dioxide reacts with rocks, a process that usually takes thousands of years. Silicate weathering begins with the reaction between water, carbon dioxide and silicate rocks which breaks down the rock. Puro.earth has developed the world's first carbon crediting methodology for Enhanced Rock Weathering. 

 

Enhanced Rock Weathering Methodology

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Geologically Removed 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. Puro.earth's Geologically Stored Carbon methodology does not cover capturing CO2 from fossil fuels, only from biogenic sources.

 

Enhanced Rock Weathering Methodology
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Woody Biomass

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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