Captain Drawdown’s weekly Sunday selection — 15 candidate stories considered, 6-9 picked. Each link carries our 1-2 sentence take so you don’t have to click everything to know what’s there.
The week’s signal sits at the intersection of policy plumbing and capital flows: jurisdictions are linking compliance markets while private registries and ocean-CDR vendors raise rounds that bet on those markets actually clearing. Meanwhile, the methodology frontier keeps creeping into stranger biology — fungi-mediated soil carbon credits being the latest test of what measurement, reporting, and verification (MRV) can credibly underwrite.
Compliance market plumbing
- The Nature Conservancy — TNC Applauds California, Québec and Washington for Advancing Carbon Market Linkage — A three-jurisdiction WCI linkage would be the largest North American compliance pool since Ontario exited in 2018, and the regulatory choreography (each jurisdiction running parallel rulemakings) is what determines whether CDR pathways get a real demand pull from the program post-2030.
- Carbon Herald — Nine Countries Join CCSA To Coordinate CCUS Policies In Europe — A national-associations forum sounds like a talking shop, but Europe’s CCS pipeline (Northern Lights, Porthos, Greensand) is bottlenecked on cross-border transport rules and state-aid harmonization — exactly the unglamorous stuff this venue exists to unblock.
Capital flows
- Carbon Herald — Captura Secures New $12.5M To Grow US Production Of Its Bipolar Membrane Electrodialysis Tech — A modest Series B extension, but notable as one of the few ocean-CDR rounds closing in a quarter when mCDR sentiment has cooled; the membrane stack is the cost-down lever Captura needs to hit before its Hawaii and AltaSea pilots scale.
- Capital Reset — Concorrente da Verra, Isometric capta R$ 210 milhões — ~$38M for a durable-CDR registry is a real vote of confidence that the Verra/Gold Standard duopoly has room beside it; the Mombak and Re.green client list also signals Isometric is making a serious play for Brazilian high-durability ARR, not just engineered removals.
Methodology frontier
- CarbonMeld — Why the First Verified Soil-Carbon Credits From Mycorrhizal Fungi Matter — Mycorrhizal pathways have been the white whale of soil carbon because the glomalin fraction is genuinely more durable than bulk SOC, but verification still hinges on whether MRV can distinguish fungal-driven stocks from baseline noise at field scale.
- Carbon Herald — USDA Moves To Open Biofuel Premium Markets To Regenerative Farmers — The interesting wrinkle is the 45Z/CI-score linkage: if regen practices count toward biofuel carbon intensity, farmers get paid twice (premium grain + implicit carbon value) without ever touching a voluntary credit — a structural threat to ag-VCM volume.
- arXiv — Carbon Farming: An Expository, Inter-Disciplinary Survey — A useful taxonomy paper that walks through the regenerative/organic/sustainable definitions buyers keep conflating in procurement RFPs; worth skimming before your next ag-CDR diligence call.
Ocean alkalinity, slowly
- Science 2.0 — Could Electrochemistry Help De-Acidify the Oceans? — A measured read on where electrochemical ocean alkalinity enhancement (OAE) sits scientifically — useful counterweight to the vendor narrative, with a clear-eyed treatment of the alkalinity-perturbation monitoring problem that EDF and others have flagged as the field’s gating constraint.
The dominant signal this week is institutional: registries raising, jurisdictions linking, associations forming. Conspicuously absent — no major offtake announcements, no new DAC FID, and silence from the US DOE side of the house, which after the FY26 appropriations cycle is starting to feel less like a pause and more like a structural retreat.