Swiss registry certifies biochar carbon storage in concrete

Carbon Standards International (CSI), a Swiss-based registry, has introduced an updated version of its Global Biochar Carbon Sink (C-Sink) standard, version 3.1. This revision now includes the certification of carbon removal credits for biochar used in concrete, offering innovative pathways for long-term carbon storage.

A modern building with a concrete finish, surrounded by green deciduous trees. AI generated picture.

Under the new standard, biochar embedded in concrete can qualify for C-Sink 1000+ credits, representing carbon sequestration lasting up to 1,000 years, with 75% of the carbon retained. The methodology also provides options for shorter durations: C-Sink 100 ensures 17.1% storage for 100 years, and C-Sink 60 certifies temporary storage for 60 years.

The updated rules emphasise the durability of building materials, such as cement, lime, clay, gypsum, and geopolymers, as permanent matrices for biochar. These materials either remain in use or are eventually repurposed or deposited in soil, ensuring the longevity of the carbon sink.

The certification applies exclusively to biochar that meets the European Biochar Certificate or World Biochar Certificate standards, broadening its global applicability. CSI confirmed that version 3.1 of the standard is available for immediate implementation, potentially accelerating the adoption of biochar in construction and contributing to global carbon reduction goals.

Read more: High-quality carbon credits gain traction as market evolves

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