CSI is pioneering carbon removal and storage using innovative, specially engineered underground clay vaults in East Texas to permanently trap and store woody biomass.
We Lead the Way
CSI produces tangible, physical carbon removals designed to last far beyond a single generation. Our Terrestrial Storage of Biomass (TSB) method physically locks carbon-rich wood into underground vaults, where engineered anaerobic conditions greatly slow decomposition. By removing oxygen and water contact, we prevent the release of potent greenhouse gases like CO₂, methane, and volatile organic compounds, all while mimicking the natural processes that form coal over geological timescales.
We reinforce our commitment to scientific rigor by aligning each stage of our work with ISO 14044 Life Cycle Assessment guidelines. Our continuous Monitoring, Reporting, and Verification (MRV) process allows us to track emissions data, refine site criteria, and share transparent results that confirm the durability of our carbon storage. We believe that only by quantifying every step—wood sourcing, transportation, burial, and long-term monitoring—do we earn the trust of our partners and stakeholders.
Central to this approach is the CSI-MRV Trust, which holds a 300-year easement and oversees the buried storage sites. Funded by proceeds from our carbon credit sales, the trust monitors the vaults, ensures we comply with environmental regulations, and pursues reforestation efforts on the reclaimed surface. In doing so, it safeguards both the stored carbon and the surrounding ecosystems, preserving the land for future generations.
Our focus on tangible, measurable carbon storage brings clear benefits to communities and the environment. We reduce harmful emissions that would otherwise enter the atmosphere through decay or burning, and we enrich local economies by creating jobs in site preparation, excavation, and ongoing monitoring. Most importantly, we offer a proven, scalable solution that allows society to address climate change in a practical, long-term way.
By combining sound science, robust verification, and active stewardship, CSI delivers one of the most straightforward and enduring forms of carbon removal available today.
Leaders in natural carbon removal innovation.
Our Mission is Simple: Provide the best, cleanest, and most affordable way to trap and bury the carbon in wood while preserving the land for plants, wildlife, and local communities. By combining careful site selection, cutting-edge monitoring, and meaningful community engagement, we aim to store carbon for over a thousand years and help forge a healthier future for everyone. Headquartered in Houston, Texas, we sit at a hub of global trade yet remain close to the field, allowing us to partner with organizations and individuals worldwide.
We invite you to explore how our Terrestrial Storage of Biomass method can contribute to a sustainable future, prevent harmful emissions, and bring lasting social and ecological benefits to the regions where we operate.
Working with the Community and the Environment
Headquartered in Houston, Texas, our projects are located in the southeast portion of the Lone Star State.
We are close to the field, but also at the epicenter of commerce and trade, making us ideal to partner with anyone anywhere in the world.
Forests are actively managed and a fraction is selectively harvested via collection of dead wood, timber slash, or cutting of non-commercial trees.
In Terrestrial Storage of Biomass, wood residues are buried in engineered sub-surface pits, creating anaerobic conditions that significantly slow wood decomposition and substantially limit the production and migration of methane and CO2.
Our long-term storage method, Terrestrial Storage of Biomass (TSB), moves carbon within wood into the slow decay cycle.
The biomass is stored in underground vaults, sequestering it by eliminating above-ground decomposition or burning of forest residues. This process removes oxygen and water contact from above, and beneath, the sealed carbon chamber, resulting in biomass being stably stored for over a millennium!
Co-benefits include:
Cleaner air in rural communities where the wood would have been burned
Increased oxygen levels
Improved air quality
Employment opportunities in rural communities
Improved access to forested areas
Improved drainage in flood-prone areas
Utilization of waste products
Opportunities to create long-term forested habitats