Puro.earth
Dedicated engineered carbon removal marketplace. Strong biochar methodology with well-defined durability thresholds and buyer trust.
The Basics
What is biochar?
01
Carbon captured, not burned
When crop residue decomposes or is burned, its stored carbon returns to the atmosphere as CO₂. Pyrolysis converts that same residue into biochar — a stable, solid form of carbon that stays in soil for centuries.
Biochar is the carbon-rich product of pyrolysis — heating biomass at 300-700°C in a low-oxygen environment. Unlike burning, pyrolysis prevents the carbon from fully oxidizing. Instead, it locks it into a porous, aromatic carbon structure that is remarkably resistant to decomposition.
This is why biochar is classified as durable carbon removal — unlike reforestation or soil carbon sequestration, biochar's carbon is physically locked in place, with a measured half-life of hundreds to thousands of years.
02
Soil improver, not just carbon storage
Biochar's porous structure improves water retention, provides habitat for beneficial microbes, and increases cation exchange capacity — helping soil hold nutrients instead of losing them to leaching or salt buildup.
The Process
Pyrolysis: the science behind the carbon lock
Pyrolysis is a well-understood thermal process used across bioenergy, materials science, and agriculture. SmartCarbon applies it specifically for durable carbon removal.
01
Feedstock loading
Biomass — cotton stalks, wheat straw, or orchard residue — is loaded into a sealed reactor chamber. Moisture content is controlled to ensure consistent conversion.
02
Heating (300-700°C)
The chamber is heated in a low-oxygen environment. Without sufficient oxygen, the biomass doesn't burn — instead, it undergoes thermal decomposition, breaking down volatile compounds.
03
Carbonization
As temperature rises, the biomass transforms. Hemicellulose decomposes first (~250°C), then cellulose (~350°C), and finally lignin (~500°C). The remaining solid is biochar — a porous, carbon-rich structure.
04
Cooling & collection
The biochar is cooled in a controlled environment, then collected, screened, and tested. Its physical and chemical properties determine which application it's best suited for.
Carbon Durability
Why biochar carbon lasts for centuries
01
Aromatic carbon structure
The high-temperature pyrolysis process creates polycyclic aromatic carbon — a molecular structure so stable that soil microbes cannot easily break it down. This is why biochar persists in soil for hundreds to thousands of years.
Unlike plant-based carbon sequestration (trees, soil organic matter), biochar's durability is not biological — it's chemical. The carbon in biochar is physically locked into a structure that resists microbial decomposition, even under varying soil conditions.
This durability is exactly what carbon credit registries require. When SmartCarbon issues credits through a durable carbon removal registry, each tonne of biochar produced represents carbon that has been removed from the atmospheric cycle — not just temporarily stored.
02
Measured, not assumed
Durability isn't a claim — it's a measurable property. Biochar samples are tested for H/Corg ratio, PAH content, and stability indices. These metrics determine eligibility for durable carbon removal registries.
Government Partnership
Working with national institutions, not around them.
Biochar programs succeed when they align with agricultural policy. SmartCarbon's approach is built on government partnership from day one.
Institutional alignment
SmartCarbon's program is designed to align with Uzbekistan's agricultural development strategy. The Fergana Valley pilot was developed alongside regional authorities, with national visibility achieved through a formal presentation to government leadership.
- Ministry of Agriculture — advisory role on soil restoration methodology
- Regional Governor's office — MOU signed for Fergana Valley pilot
- Special Economic Zone — 5 ha land allocation identified
Partner logos
These logos reflect active cooperation agreements. Institutional presence does not imply endorsement of financial terms.
Registry & MRV
Five registries under evaluation — one rigorous standard.
Biochar is one of the most well-documented forms of durable carbon removal. SmartCarbon evaluates registry pathways based on monitoring rigor, buyer recognition, and project fit.
Isometric
Science-first CDR registry with rigorous verification. High buyer confidence and transparent methodology documentation.
Verra VM0044
Methodology for improved agricultural land management. Well-established framework with broad market recognition.
Gold Standard
Strong co-benefit focus. Well-suited for projects that deliver verified soil restoration alongside carbon removal.
European Biochar Certificate
Established European certification standard with detailed quality requirements for biochar products.
Selection is based on monitoring requirements, buyer recognition, and fit with the project's data infrastructure. A primary pathway will be confirmed during the technology selection phase.
Science FAQ
Your questions, answered.
Pyrolysis is the thermal decomposition of biomass at elevated temperatures (300-700°C) in a low-oxygen environment. This converts organic material into biochar — a stable, carbon-rich solid — along with syngas and bio-oil as byproducts.
Laboratory and field studies show biochar carbon can persist in soil for hundreds to thousands of years. This long residence time makes biochar a durable form of carbon removal, suitable for carbon credit registries that require permanence.
Biochar improves soil structure, increases cation exchange capacity, and enhances water retention. These properties help reduce salt stress on plant roots by improving drainage and buffering salt concentrations — making biochar suitable for salinity remediation on salt-affected farmland.
While both are produced by heating biomass, biochar is specifically optimized for soil application and carbon storage. It's produced at controlled temperatures to maximize carbon stability and surface area, whereas traditional charcoal is typically produced for fuel use with less process control.
SmartCarbon
Want the full technical documentation?
Request a briefing to access our detailed science and engineering documentation, including pyrolysis specifications, feedstock analysis, and MRV design.