What is Biochar?

What Is Biochar? A Simple Guide for Carbon Market Professionals

If you spend any time around carbon markets, you've probably noticed biochar coming up more often lately. It's not a new idea, farmers have used charred organic matter to improve soil for centuries, but it's become one of the more talked-about carbon removal methods in voluntary and compliance markets alike. For anyone working in emissions management, sustainability, or climate finance, understanding biochar isn't just useful background knowledge. It's increasingly relevant to how carbon credits are sourced, priced, and verified.

This article breaks down what biochar actually is, how it's produced, and why it's earning a growing place in carbon offset portfolios.

What Is Biochar, Exactly?

Biochar is a stable, carbon-rich material made by heating organic matter, things like wood chips, crop residue, or agricultural waste, in a low-oxygen environment. This process is called pyrolysis. Instead of the material fully decomposing or burning away (which releases carbon dioxide back into the atmosphere fairly quickly), pyrolysis locks that carbon into a solid form that resists breakdown for centuries, sometimes longer.

Think of it this way: when plant matter rots or burns normally, most of the carbon it absorbed during growth returns to the atmosphere within years. Biochar interrupts that cycle. The carbon gets trapped in a stable structure instead, which is exactly why it's caught the attention of carbon removal developers and buyers.

How Biochar Is Actually Made

The production process is simpler than it sounds:

• Feedstock selection: Organic waste is gathered, this can include forestry residue, nutshells, crop stubble, or even certain manures.
• Pyrolysis: The feedstock is heated in a low-oxygen chamber, typically between 350°C and 700°C.
• Carbon stabilisation: The heat converts the material into a porous, charcoal-like substance that's chemically stable and resistant to microbial breakdown.
• Application or storage: The resulting biochar can be added to soil, used in construction materials, or stored for long-term carbon sequestration.

The exact temperature and duration of pyrolysis affect the final product's properties, including how long it will hold carbon and how well it improves soil quality.

Why Biochar Matters for Carbon Removal

Here's where things get interesting from a carbon markets perspective. Most nature-based solutions, like reforestation, sequester carbon but carry some risk of reversal. Trees can burn, get logged, or die from disease, releasing stored carbon back into the atmosphere.

Biochar behaves differently. Once carbon is locked into its structure, it tends to stay there. Studies estimate biochar can retain carbon in soil for hundreds to over a thousand years, depending on conditions. That durability is a big part of why buyers looking for high-permanence carbon removal are paying closer attention to it.

This growing interest has real implications for anyone active in a carbon offset platform, since biochar credits are increasingly being listed alongside more established offset categories like renewable energy and afforestation projects.

Biochar's Role in Carbon Trading and Credit Markets

Biochar-based carbon credits work similarly to other removal credits: a project developer produces biochar, applies it (usually to agricultural soil), and has the carbon removal independently verified. Once certified by a recognised standard, such as Puro.earth or Verra, the resulting credits can be listed and traded.

If you're new to how this process works more broadly, this guide on how carbon trading works is a useful starting point for understanding the mechanics behind credit issuance and trading.

What makes biochar particularly appealing to buyers is the combination of measurability and permanence. Unlike some offset types where quantifying actual carbon impact can be tricky, biochar's carbon content can be tested directly, and its stability is well documented. That's a meaningful advantage when companies are trying to build a credible, defensible offset strategy rather than one that invites scrutiny later.

For businesses sourcing these credits, working through a reliable digital carbon marketplace simplifies the process considerably, especially when transparency and traceability matter as much as the underlying carbon science.

Pricing, Verification, and Market Data

Biochar credits tend to trade at a premium compared to many other offset types, largely because of their durability and relatively straightforward MRV (monitoring, reporting, and verification) process. That said, prices vary depending on feedstock, region, certification standard, and co-benefits like soil health improvements.

For teams trying to track how biochar credits are priced relative to other instruments, carbon market intelligence tools can help make sense of shifting valuations across project types. Having access to real time global carbon credit pricing is particularly useful given how quickly demand for durable removal credits has been growing.

Companies building out their internal emissions strategy often pair this kind of market data with a GHG accounting software or emissions tracking tool, since credible offsetting only makes sense once a company has a clear picture of its own footprint. If you're earlier in that process, this step-by-step guide to building a carbon reduction strategy walks through how to approach emissions reduction before turning to offsets.

Beyond Carbon: Why Biochar Appeals to Sustainability Teams

Carbon removal isn't the only reason biochar is gaining traction. It also offers agricultural and environmental co-benefits, which matter increasingly to buyers looking for credits with broader impact:

• Improved soil fertility: Biochar helps retain water and nutrients, often boosting crop yields.
• Reduced fertiliser runoff: Its porous structure can help hold nutrients in place rather than letting them wash away.
• Waste reduction: Biochar production gives a productive use to agricultural residues that might otherwise be burned or left to decompose, releasing emissions in the process.

These co-benefits make biochar attractive for companies pursuing net-zero commitments that also want to demonstrate community or environmental impact alongside pure carbon metrics. For companies exploring how credits like these fit into a broader net-zero strategy, this piece on how companies can use carbon credits to achieve net-zero offers useful context.

Where Biochar Still Faces Challenges

Biochar isn't without its complications. Scaling production consistently across different feedstocks and regions can be difficult, and not all biochar is created equal, its carbon content and stability vary depending on production methods. There are also ongoing conversations in the market about standardising measurement approaches so that biochar credits remain comparable and trustworthy as the category grows.

None of this undermines biochar's value as a carbon removal tool, but it's worth factoring into due diligence when evaluating specific projects or credit batches.

The Bottom Line

Biochar sits at an interesting intersection of old agricultural wisdom and modern carbon science. It offers a relatively simple, measurable, and durable way to remove carbon from the atmosphere while delivering real benefits to soil and land use. As demand for high-permanence carbon removal grows, biochar is likely to keep expanding its footprint across both voluntary and compliance carbon markets.

For anyone building a carbon strategy, sourcing offsets, or simply trying to understand where the market is heading, biochar is well worth keeping on the radar.