Captain Drawdown’s daily logbook on every CDR story, paper, and expert voice — so you don’t have to read them all.
The story
Microsoft just signed for 557,000 tonnes of biochar carbon removal from Varaha, an Indian developer working with smallholder farmers across Gujarat, Rajasthan, and Maharashtra. The contract, reported this week, is the largest biochar offtake on record. It is larger than every North American and European biochar deal combined to date. And it lands in a country that has no national CDR registry, no compliance carbon market for removals, and no central-government framework for classifying or exporting durable removal credits.
That is the story. The world’s most ambitious corporate CDR buyer just made a single Indian smallholder-aggregation company the largest contracted source of durable biochar tonnes on the planet, and India’s central government had nothing to do with it.
The mechanism
Varaha’s model is not a centralised pyrolysis plant. It is an aggregation network. Smallholder farmers convert crop residue (the stuff that would otherwise be open-burned across the Indo-Gangetic plain every winter) into biochar using distributed slow-pyrolysis kilns, then apply it back to their own soils. The carbon stays put for centuries on the conservative end of the durability curve, and the farmers get a soil-health co-benefit.
The science underpinning this pathway is now well past contested. Recent peer-reviewed pyrolysis work continues to validate slow-pyrolysis biochar as durable carbon dioxide removal with measurable agronomic upside. That is the scaffolding Microsoft’s diligence team needed to underwrite a half-million-tonne contract from a single supplier. We’ve written before about why durable removal needs more than trees - biochar is exactly the kind of pathway that argument was pointing toward.
The R&D base is Indian too. Feedstock-characterisation work coming out of Sardar Vallabhbhai Patel University and similar ag-research institutions is doing the unglamorous work of mapping which Indian crop residues produce which biochar properties. None of this was funded by a national CDR mandate. It pre-existed the carbon market.
The market angle
Run the unit economics. Smallholder feedstock is essentially free (it’s a waste stream). Labour costs are a fraction of US or EU equivalents. Distributed kilns are low capital expenditure compared with industrial pyrolysis trains. Even after generous farmer revenue shares and measurement, reporting and verification (MRV) overhead, the marginal tonne out of an Indian smallholder network prices well below anything coming out of a North American facility.
That is what 557,000 tonnes from one developer tells you. A single Indian aggregator just priced the marginal biochar tonne for the global voluntary market. Suppliers in Iowa, Saskatchewan, and Bavaria need to reckon with that. So do their investors.
The buyer side is concentrating in parallel. Microsoft is now responsible for an outsized share of all contracted durable removals globally. Frontier, Google, Meta, and Amazon will face direct pressure to either follow into Indian biochar or justify why they are paying two to five times more per tonne elsewhere.
The policy void
Here is the part nobody is talking about. India has no national CDR registry. No domestic compliance demand for removals. No export-classification rule for carbon credits. No central-government policy on whether removals generated on Indian soil and sold to a US hyperscaler count toward India’s Nationally Determined Contribution or the buyer’s net-zero claim.
The build-out is happening at the state and private level. The first community-scale biochar production unit in northeast India was funded by the Meghalaya state government, not New Delhi. Contrast this with Brazil, where the federal government has been actively shaping the policy frame around enhanced rock weathering exports. India has done none of that work, and the tonnes are flowing anyway.
That is a regulatory time bomb. If the central government decides next year that exported removal credits need to count toward India’s NDC, or that a domestic-share rule applies, every tonne in the Varaha-Microsoft contract is exposed to retroactive accounting risk.
What the voices are saying
Robinson Meyer at Heatmap characterised 2026 climate-tech funding as “a tale of two points on the development curve. While later-stage funds are still making investments, early stage funding is suffering, which could spell trouble.” The Varaha deal fits that pattern exactly. Late-stage offtake capital flowing to an already-operating Indian network, with no visible pipeline of early-stage Indian CDR startups behind it.
Oxford Net Zero noted that new research shows “corporate net-zero standards are increasingly aligned. This means they can drive real progress on reaching net zero.” Standards convergence is precisely what lets Microsoft underwrite Indian biochar at this volume. But the convergence is happening on the buyer side in the Global North. Indian domestic policy is not part of that conversation.
The counter-argument
Skeptics will say a single offtake does not make a supply backbone. Western biochar players will point to commercialisation challenges flagged by commentators inside the sector itself and argue that smallholder aggregation has its own failure modes: monitoring difficulty, kiln-quality variance, farmer attrition. They are not wrong. A half-million-tonne contract is an underwriting bet, not a delivered tonne.
The CDR-is-residual-only constraint also matters here. Microsoft’s biochar purchase does not license a single extra tonne of fossil emissions. Removal at this scale only makes sense alongside aggressive abatement, not instead of it.
Verdict
The centre of gravity for biochar supply is now South Asian smallholder aggregation. That shifts the risk profile for every buyer from technology execution to country risk, land tenure, foreign-exchange exposure, and Indian domestic policy stability. If you are diligencing biochar in 2026, you need a country-risk lens, not just an MRV lens. Watch whether New Delhi responds before Google, Meta, or Amazon follow Microsoft in. That regulatory window is the single most important variable in durable CDR supply for the next eighteen months.
Citations
- cdr.fyi — reported this week
- Sciencedirect — peer-reviewed pyrolysis work
- Bluesky — Sardar Vallabhbhai Patel University and similar ag-research institutions — Bluesky post
- Bluesky — first community-scale biochar production unit in northeast India — Bluesky post
- Bluesky — characterised 2026 climate-tech funding — Bluesky post
- Bluesky — noted that new research — Bluesky post
- Bluesky — by commentators inside the sector itself — Bluesky post