Posts

Captain's CDR Log #241: The MRV fight underneath every enhanced rock weathering credit you can buy

Captain Drawdown’s daily logbook on every CDR story, paper, and expert voice — so you don’t have to read them all. Why this matters now Two things happened in parallel this month. A Nature paper argued that soil and critical-zone processes trap much of the alkalinity enhanced rock weathering (ERW) is supposed to send to the ocean. And Commons and InPlanet announced a distribution deal to sell more ERW credits to more buyers. The measurement debate and the sales channel are moving in opposite directions. If you buy or underwrite these tonnes, you need to understand the argument underneath the invoice. ...

Mantel bags $18M to scale hot molten-borate carbon capture

Carbon Herald just published Mantel Secures $18M Investment To Scale Molten-Borate Carbon Capture. Carbon Herald reports that Mantel, a carbon capture technology developer, has raised $18 million in a strategic investment round led by Constellation Technology Ventures. The funding is aimed at scaling the company’s molten-borate carbon capture process, which uses hot liquid borate salts to absorb CO2 from industrial flue gas at high temperatures. The approach is being pitched as a way to handle emissions from heavy industry and power sectors more efficiently than conventional amine-based systems. The round adds a major utility-linked backer to Mantel’s cap table as it moves toward larger pilot deployments. ...

Captain's CDR Log #240: One state loan for coal CCS outweighs a quarter of durable CDR venture capital

Captain Drawdown’s daily logbook on every CDR story, paper, and expert voice — so you don’t have to read them all. $205 million. That is the size of the low-interest state loan the North Dakota Industrial Commission just approved for Project Tundra, a post-combustion carbon capture retrofit on the Milton R. Young coal station (Carbon Herald). The prior reference point matters. Compare Tundra’s loan to Mantel’s $18M round for molten-borate carbon capture, one of the week’s headline private raises for a novel capture pathway. The public loan is roughly eleven times the private equity cheque, and it goes to a mature amine-style retrofit on a fossil asset rather than to an early-stage technology that could eventually serve removal use cases like bioenergy with carbon capture (BECCS). ...

CDR Daily Digest — 2026-08-27

The industry is crowded, contracting, and quietly rewriting its social contract The clearest signal across today’s four stories: CDR is entering the phase where breadth of activity collides with narrowness of survival. I count 969 companies tracked across the field, 377 of them in biochar alone. That is not a healthy distribution. It is a gold rush. And two of today’s conversations, one looking back at the hype cycle and one looking forward at farmer consent in Canada, are essentially about what comes after the rush ends. ...

Take: #10: hype and a gold rush followed by contraction and consolidation

Take on a podcast episode from Carbon Removal Newsroom, originally published Tue, 25 Au. Listen: https://climateworkersanonymous.com/p/10-hype-and-a-gold-rush-followed TL;DR Anonymous submission argues carbon dioxide removal (CDR) is living out a textbook boom-bust: 2022-2024 gold rush, now contraction. Not novel, but fairly stated. Frames CDR as commodity-like and therefore structurally cyclical, with hoped-for upward trendline. Reasonable analogy, understates policy-driven demand fragility. Prescription: counter-cyclical discipline at the individual/company level — conservative in booms, patient in busts. Sensible but generic. Kenyon’s own gloss: blaming “macro conditions” explains everything and nothing; entrepreneurs are supposed to trim sails. Useful pushback. Bonus tangent: Stripe’s Collisons reportedly calling “singularity” internally — Kenyon wonders what that means for CDR buyers. Speculative but worth noting. Ross Kenyon’s Climate Workers Anonymous #10 runs a single anonymous submission on the CDR business cycle: how a 2022-2024 hype phase drove overexpansion, and how the current contraction is the predictable other side of that same coin. Kenyon reads the submission, then layers on his own commentary about founders using “macro conditions” as a catch-all excuse and about what a nearer-than-expected AI capability jump might mean for CDR buyer behavior. ...

Take: Canada’s Next Industrial Play: What It Takes to Earn a Farmer’s Yes

Take on a podcast episode from The Carbon Curve, originally published Wed, 26 Au. Listen: https://carboncurve.substack.com/p/canadas-next-industrial-play-what TL;DR Miniseries opener framing carbon removal as a layer on Canada’s $1T industrial buildout ahead of Carney’s September investment summit — useful political framing. Jim Mann (UNDO) claims enhanced rock weathering on farmland accelerates natural weathering “50 to 100,000 times” — the upper bound feels rhetorical, but the mechanism is standard. UNDO’s model: give crushed silicate to farmers free, cover transport and spreading, keep all carbon revenue. Farmer-adoption pragmatism, not revenue-sharing idealism. Mann’s claim: Canada’s 100–300 Mt/yr residual removal need “could all be done with enhanced rock weathering.” Overstated, but the feedstock-plus-farmland argument is real. CFA’s Brody Berrigan on why adoption stalls: farmers are business owners first, extension services have been gutted since the ’90s, neighbor-to-neighbor is the real diffusion channel. Na’im Merchant kicks off a Carbon Curve miniseries on embedding durable carbon dioxide removal into Canadian industrial projects, timed to Prime Minister Carney’s September 14-15 investment summit. Episode here. Episode one pairs UNDO founder Jim Mann on enhanced rock weathering economics with the Canadian Federation of Agriculture’s Brody Berrigan on what it actually takes to get Prairie farmers to say yes. ...

Podcast take: What Does CDR Actually Cost in Europe? - with Hansjörg Lerchenmüller and Eadbhar

Take: What Does CDR Actually Cost in Europe? - with Hansjörg Lerchenmüller and Eadbhard Pernot

Take on a podcast episode from The CDR Policy Scoop, originally published Sun, 23 Au. Listen: https://shows.acast.com/the-cdr-policy-scoop/episodes/what-does-cdr-actually-cost-in-europe-with-hansjorg-lerchenm TL;DR Commission’s ETS review cost forecasts for durable CDR trace to just four sources (McKinsey 2023, Ramboll Ecologic 2025, NEGEM 2023, CDR.fyi 2023) — thinner foundation than the policy weight implies. Bio-CCS low-cost anchor of €172/t leans on €165/t of assumed energy revenue and calibration against an unverifiable 2022 Drax conference remark. Overstated confidence. direct air carbon capture and storage (DACCS) range comes entirely from a black-box McKinsey report; no inspectable assumptions on energy, T&S, or learning rate. Useful flag. Biochar low bound (€37–66/t) reflects Global South artisanal systems; Hansjörg says European scalable price is €175–200/t. First-time-cited industry number worth having. Practical asks: modelers should use current CDR.fyi data, be transparent about assumptions, and suppliers should submit transaction data. Signal-dense. Eve Tamme and Sebastian Manhart host Eadbhard Pernot (Carbon Management Europe) and Hansjörg Lerchenmüller (Biochar Europe) to stress-test the cost assumptions behind the European Commission’s July 2026 ETS review impact assessment. The episode walks through bio-CCS, DACCS, and biochar carbon removal cost curves line by line — where the numbers actually come from, and where they fall apart. ...

Biochar dominates CDR with 377 of 969 tracked companies

This chart is a stacked bar count of every company in the CDR Directory, grouped along the x-axis by removal pathway (direct air capture, enhanced weathering, biochar, ocean alkalinity, and so on), with each bar segmented by business focus: pure-play producers, brokers and marketplaces, and firms where CDR is a side business bolted onto a different core model. The total height tells you which pathways are crowded with company formation. The segment mix tells you something a raw count hides: whether a pathway’s apparent size is built on operators actually delivering tonnes, on intermediaries reselling them, or on incumbents whose CDR line is a minor adjunct. Two pathways with identical totals can have very different underlying economies once you see the split. ...

CDR Daily Digest — 2026-08-25

The signal today: CDR is scaling as a research field, but not as a market Four stories, one tension. The people doing the science are multiplying fast. The projects that would turn that science into tonnes in the ground are still getting killed by weak carbon prices. That gap is the story of 2026 so far, and today it showed up in sharp relief. The research base tripled. That matters more than any single announcement. The active CDR researcher pool hit roughly 32,000 people, up from about 10,000 four years ago. I pulled this from the latest CDR Researcher Census I analysed this week. Triple-digit percentage growth in a scientific workforce over four years is unusual. For comparison, the field now rivals mid-size established disciplines in headcount, though not yet in funding per researcher. ...

Take: Interview with Matthew Green

Take on a YouTube video from Annie Luo, originally posted 2026-08-24. Watch the source: https://www.youtube.com/watch?v=27j8NEY2bR0 TL;DR Matt Green (ASU, Center for Negative Carbon Emissions) walks through moisture-swing and polymer sorbent direct air capture. Standard intro material for CDR insiders. Claim: moisture-swing sorbents release CO₂ via humidity change, no 80–120°C thermal swing needed. Well-established (Lackner lineage) but clearly explained. Interesting application angle: coupling moisture-swing DAC to greenhouse exhaust streams to boost plant growth. Niche but concrete. Argues polymer sorbents win on cost because plastics processing infrastructure is already cheap and mature. Reasonable, underexplored framing. No new numbers, no cost figures, no pilot data disclosed. This is a public-education interview, not a technical update. Matt Green, chemical engineering professor at Arizona State University and director of the Center for Negative Carbon Emissions, sits down with student interviewer Annie Luo (video here) for a general-audience walkthrough of direct air capture (DAC): why 400 ppm makes selective sorbents hard, why polymer chemistry is well-suited to the problem, and how moisture-swing regeneration sidesteps the thermal energy penalty of amine systems. If you already know what a moisture-swing sorbent is, most of this will be review. ...