Today’s four stories share one shape: the fastest-growing source of durable CDR supply is not new machines built from scratch. It is existing industry with removal bolted on. An ethanol plant that already vents a pure CO₂ stream. A palm-processing operation that already piles up nutshells. A government that already has forestry and farm residues to manage. Call it “bolt-on removal”: take a process that is running anyway, and route its carbon underground or into a stable solid instead of into the air.

That shape matters because it changes what the bottleneck is. For a new direct air capture plant, the constraint is capital and energy. For bolt-on removal, the constraint is accounting, permitting and offtake. Today’s stories are about that second set of problems.

ADM’s 800,000 tonnes shows retrofits now set the durable-supply ceiling

Captain Drawdown’s daily CDR Log #274 centres on ADM and the 800,000 tonnes of CO₂ tied to its retrofit approach, and on the wider group of ethanol plants adding capture to fermentation. Fermentation CO₂ is close to pure, so the capture step is cheap compared with scrubbing it out of flue gas or ambient air. That is why these plants are moving first and why they currently define what durable supply looks like in volume.

The catch is in the carbon origin. Corn-derived CO₂ counts as biogenic, which makes storing it a form of BECCS (bioenergy with carbon capture and storage). But the removal claim is only as strong as the farm-side accounting: fertiliser emissions, land-use change and the counterfactual fate of the biomass all sit outside the plant fence. The Log’s position is that these tonnes are real but conditional. A retrofit buyer should price in that conditionality.

One more caveat: 800,000 tonnes at a single large operator says more about ADM’s head start than about the sector. The Log cannot yet tell whether the second and third tier of ethanol retrofits will hit similar numbers or stall on pipeline and injection-well permits. That is the open question.

CERT Systems turns CO₂ into ethylene, which is utilisation, not removal

My conversation with Alex Ip of CERT Systems covers electrochemical conversion of CO₂ to ethylene, the feedstock for most plastics. The chemistry is clean on paper: electricity, water and CO₂ in, ethylene out. If the electricity is low-carbon and the CO₂ is captured from air or biomass, the product carries less embedded fossil carbon than conventional ethylene.

But this is carbon utilisation, not carbon removal, unless the ethylene ends up in a product that stays out of the atmosphere for a century or more. Most plastic does not. Burned or landfilled, the carbon returns within years to decades. So the right frame for CERT Systems is displacement of fossil ethylene, which is an emissions reduction, with a removal credential only on the long-lived fraction. Ip is clear-eyed on this. The CDR market should be too, because conflating the two inflates removal numbers and hands critics an easy target.

Why include it in a CDR digest at all? Because CO₂-to-product companies will compete for the same captured CO₂ streams as storage projects. If ethylene pays more per tonne than a storage credit, biogenic CO₂ flows to plastics rather than to permanent removal. That competition for molecules is coming.

Taiwan’s environment minister is treating biochar as infrastructure, not a side project

Minister Chi-ming Peng’s interview lays out a government view of biochar as a core removal pathway rather than a niche soil amendment. The logic is bolt-on removal at national scale: Taiwan has agricultural and forestry residues that must be managed regardless, and pyrolysis turns that waste-handling cost into stable carbon plus usable heat.

Government backing changes the economics in a specific way. Private biochar producers live or die on offtake for both the char and the credits. A ministry that sets procurement rules, residue-collection logistics and MRV (measurement, reporting and verification) standards removes much of that risk. The downside is the same for any state-led pathway: if the standard is set loose, every tonne it certifies loses credibility abroad. Peng’s bet pays off only if Taiwan’s MRV survives scrutiny from international buyers. That is the test to watch.

Biochar Industrial Group shows the cheapest feedstock is the one already piled up

Uzoma Ayogu’s Biochar Industrial Group started as a palm nutcracker, a machine business, and became a CDR company because palm kernel shells are a dense, dry, already-aggregated feedstock. Nobody has to grow or haul them to the plant. They are already there.

That is bolt-on removal at its purest and it explains why biochar economics in West Africa can look better than in Europe. Feedstock cost dominates biochar budgets. When the feedstock is waste at the point of processing, that line item drops toward zero. The limit is scale: palm residue volumes cap how large any single site can get, so growth means many sites rather than one big one. Verification across dozens of small sites is the hard part, and it is where most biochar projects in the Global South have struggled to date.

What’s next

Two things. First, watch whether the next tranche of US ethanol retrofits announces injection-well approvals or pipeline access this quarter. Without storage, captured fermentation CO₂ is just a cleaner vent. Second, watch for Taiwan to publish its biochar MRV methodology. If it meets the bar set by the main international registries, Peng’s bet becomes exportable. If it does not, it stays a domestic programme.

None of this replaces cutting fossil emissions at the source. Bolt-on removal handles residuals. It is not a reason to keep burning.

Today’s Stories