Today’s three stories point at the same uncomfortable truth from different angles: the CDR field keeps shipping structures that look complete but leave the hardest question unanswered. Who pays when the carbon comes back?
That question sits at the center of the EU’s newly-finalized Carbon Removal and Carbon Farming (CRCF) rules, it hovers over a fresh seed round for microalgae-based biomass carbon removal (BiCRS, or bioenergy and biomass with carbon capture and storage), and it explains why soil carbon research employs more people than six other pathways combined while still struggling to sell durable tonnes.
The CRCF ships with a reversal-liability hole
The European Commission’s CRCF carbon farming methodology is now final, and it does something strange. It defines a monitoring period, it defines reversal events, and it defines the certifier’s obligations. What it does not define, in any binding way, is who holds the liability when a soil carbon or forest carbon unit reverses after it has been sold. The buffer pool is discretionary at the scheme level. Offtake contracts written under CRCF can, in principle, pass the reversal risk entirely to the farmer or to a certifier who may not exist in 30 years.
I walked through this in Captain Drawdown’s daily CDR Log #195. The short version: an offtaker can buy a CRCF-certified carbon farming unit, claim it against a compliance or voluntary target, and face no contractual pull-back if the carbon flips out of the soil in year 12. That is not a small drafting gap. It is the entire durability question for LULUCF-adjacent (land use, land-use change and forestry) removals, and the rules ship without closing it. Compare this to the Article 6.4 approach or to the buffer mechanics in Verra’s improved forest management methodology, both of which are imperfect but at least name a counterparty.
Buyers writing CRCF offtakes right now should insist on contractual reversal terms that the regulation itself declines to require. Sellers should expect that any serious buyer will.
Arrhenius and the microalgae bet
Arrhenius closed a seed round to scale a fast-growing microalgae BiCRS pathway. The pitch is doubling times measured in hours, not the weeks or months you get with terrestrial biomass, feeding into a conversion step that locks the carbon into a durable form. The company has not published third-party measurement, reporting and verification (MRV) protocols yet, and the durability claim depends entirely on what happens to the biomass after harvest. Microalgae grown and then composted is not durable removal. Microalgae grown and then pyrolyzed or geologically stored is a different story.
This is where the technology readiness level (TRL) conversation matters. Fast-growing feedstock is a real advantage over forest-based BiCRS on land-use grounds, but the bottleneck for BiCRS has never been growing the biomass. It has been the capture-and-store step at the back end. Arrhenius will need to be specific about which back-end pathway it is committing to, and buyers should not credit tonnes until that specificity arrives.
The residual-emissions frame applies here as it does everywhere. BiCRS at scale is worth building for the tonnes that cannot be avoided. It is not worth building as cover for delayed fossil phase-out.
Soil carbon: 15,849 researchers, and a market that can’t absorb them
The CDR Researcher Census I analysed shows 15,849 active soil carbon researchers globally, more than the combined headcount across six other pathways including DAC, enhanced rock weathering (ERW), ocean alkalinity enhancement (OAE), and mineralization. That is a staggering imbalance.
The imbalance is not irrational. Soil carbon research predates the CDR framing by a century. Agricultural science funds it. It has legitimate co-benefits for food systems. But the durability profile keeps soil carbon out of the high-price durable tonne market that funds DAC and mineralization, and the CRCF gap above makes the mid-durability market harder to trust. So you get a field with enormous human capital and a buyer base that cannot pay what the science costs.
The productive read is that soil carbon researchers are the natural talent pool for ERW and for hybrid land-based pathways that inherit soil science but deliver harder durability. That transition is already happening at the edges. It should happen faster.
What’s next
Two things to watch. First, whether any major CRCF offtake published in the next quarter contains explicit reversal-liability language that goes beyond what the regulation requires. That will tell us whether the market is going to fix the drafting gap on its own. Second, whether Arrhenius names its back-end storage pathway before its next raise. Feedstock innovation without a storage commitment is not a CDR company. It is an algae company.