Posts

Take: Brineworks: From “Magic Box” to Upgraded Suit | CO₂ + H₂ for E-Fuels

Take on a YouTube video from Bite-Size Climate Tech, originally posted 2026-08-31. Watch the source: https://www.youtube.com/watch?v=j1KylS2Dnq8 TL;DR Brineworks (formerly pitched as direct ocean capture) has moved its electrochemical pH-swing box onto land, running a closed salt-water loop instead of once-through seawater. Core pitch: co-produces high-purity CO₂ and green hydrogen from the same electrolyzer, targeting e-fuel feedstock rather than pure carbon removal. Deliberately higher energy per unit output, but low capex, earth-abundant materials, no rare earths or expensive membranes — designed to run 20–50% duty cycle on cheap intermittent renewables. Interviewer confusingly introduces the guest as “Brimstone” CTO Joe Peraman; company is Brineworks. Worth flagging before you cite. Light on numbers — no $/tCO₂, no $/kg H₂, no energy intensity figures. Directional, not diligence-grade. Video link. This is a short “Bite-Size Climate Tech” follow-up with Brineworks CTO/co-founder Joe Peraman, two years after his first appearance when the company was still an electrochemical direct ocean capture (DOC) play. The substantive update: they’ve abandoned seawater feed, replaced it with a closed-loop synthetic brine (RO water plus bagged salts), and repositioned as a co-producer of CO₂ and green H₂ for e-fuel synthesis. ...

Take: Why Concrete Is the World’s Biggest Carbon Trap

Take on a YouTube video from The Odd Vault, originally posted 2026-08-31. Watch the source: https://www.youtube.com/watch?v=hltbVu1tsQM TL;DR Claims Worcester Polytechnic Institute’s enzymatic structural material (ESM) sequesters “more than 6 kg CO2 per cubic meter” vs. concrete’s ~330 kg emitted. If true, small net-negative delta per m³ — worth checking the primary source. Mechanism: carbonic anhydrase enzyme mineralizes CO2 into calcite that binds sand into a structural matrix. Legit chemistry, not new — Rahbar’s group has been publishing on this since ~2019. Name-drops UK startup Eureka (Strathclyde spin-off) using plant-derived enzymes and sourcing CO2 from distilleries/biogas. Useful pointer if verifiable. Frames ESM as “no sacrifice” drop-in replacement for concrete. Overstated — no mention of compressive strength, cost, or scale of production demonstrated. Cement = ~8% of global CO2 figure is correctly cited. Video link. This is an 8-minute explainer from The Odd Vault, a general-audience science channel, pitching enzymatic biocementation — specifically Nima Rahbar’s ESM at WPI — as a carbon-negative alternative to Portland cement. The core claim: an enzyme (carbonic anhydrase) catalyzes CO2 + calcium + water into calcite crystals that bind sand into a structural matrix, curing in hours and net-sequestering carbon. ...

Enabling tech dwarfs CDR with 7,783 workers while pure-play producers trail

This chart is a stacked horizontal bar showing CDR-attributable headcount across pathways on the vertical axis, with each bar segmented by business focus: pure-play companies whose entire reason for existing is CDR, divisions inside larger firms where CDR is one line of business, and ecosystem players who sell tools, verification, brokerage, or software into the space. Bar length is total attributed workers; the color split is where those workers actually sit. ...

Captain's CDR Log #244: Naomi Vaughan and the fight over whose evidence shapes UK CDR rules

Captain Drawdown’s daily logbook on every CDR story, paper, and expert voice — so you don’t have to read them all. Naomi Vaughan has her name on two linked preprints hosted on CDRXIV that examine how the UK builds the evidence base for its carbon dioxide removal policy. One, Slow but Sure: Expert Perspectives on Carbon Dioxide Removal Policy in the United Kingdom (June 2025), is an expert-elicitation study she co-authored with Smith and Forster. The other, Insights lost at points of vulnerability in UK policy evidence gathering on Carbon Dioxide Removal (October 2025), co-authored with Hope, names specific procedural chokepoints where non-industry and non-engineered-removal perspectives fall out of UK consultations. Both are back in focus now that 160 academics and civil-society leaders are pressing ministers to impose a carbon takeback obligation on fossil fuel producers, per Carbon Herald. ...

CDR Daily Digest — 2026-08-31

Today’s three stories share one uncomfortable throughline: the physical footprint of removal at climate-relevant scale is much larger than the policy conversation admits, and the numbers get worse when you look closely at either the land or the capture rate. A German city’s worth of DAC, and that’s just the start Glen Peters ran the arithmetic on what it takes to remove a gigatonne of CO2 per year using direct air carbon capture and storage (DACCS), and mapped it onto a mid-sized German city for scale. The energy demand, the land, the water, the sorbent throughput — all of it lands in a range that makes clear DAC cannot be the swing option for gigatonne-scale removal by itself. Peters is not anti-DAC. He is pointing out that even optimistic learning curves leave you with an industrial footprint that has to be sited, permitted, powered, and paid for, city by city, for every gigatonne. ...

$3.7B Blue Ammonia Megaproject Breaks Ground—Climate Value Hinges on Capture

Carbon Herald just published CF Industries, JERA, And Mitsui Break Ground On World’s Largest $3.7B Blue Ammonia Plant. Carbon Herald reports that a joint venture of CF Industries, Japanese power company JERA, and trading house Mitsui has started construction on a blue ammonia facility described as the largest of its kind. The project carries a price tag of about $3.7 billion. Blue ammonia is produced from natural gas with carbon capture applied to the associated emissions, and is being positioned as a low-carbon fuel and hydrogen carrier for markets in Japan and beyond. The three partners bring together fertilizer production expertise, power sector offtake demand, and global commodity trading reach. ...

Captain's CDR Log #243: Glen Peters puts a German city on the DAC footprint scale and the numbers bite

Captain Drawdown’s daily logbook on every CDR story, paper, and expert voice — so you don’t have to read them all. “Direct Air Capture (DAC) is often argued as a small footprint form of Carbon Dioxide Removal (CDR) & this is seen as an advantage. For Nuremberg (Germany) to take up its current per capita emissions…” — Glen Peters (@glenpeters.bsky.social) Peters, a lead author on IPCC carbon budget chapters, picks a single mid-sized German city and asks a question the DAC industry rarely poses in public: what would it take, on the ground, to remove that city’s per-capita emissions using DAC sited inside a European urban geography? His post walks through the arithmetic and lands on an uncomfortable result. The plant needed to offset Nuremberg would not tuck neatly beside Nuremberg. ...

Week in CDR — 2026-W35

Captain Drawdown’s weekly Sunday selection — 8 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 is concentrated on enhanced rock weathering, with two peer-reviewed papers pulling in opposite directions on whether ERW can actually deliver at scale, alongside a commercial deal extending ERW credit access. Around that core, offshore CCS gains a new contractor entrant and mineralization-in-concrete gets a fresh LCA scrutiny. ...

Captain's CDR Log #242: Two mCDR papers, one lab-versus-field split that will decide who gets permitted

Captain Drawdown’s daily logbook on every CDR story, paper, and expert voice — so you don’t have to read them all. Two preprints on ocean alkalinity enhancement (OAE) posted to CDRXIV frame the same regulatory problem from opposite ends. One argues the lab evidence base is being generated at doses no real deployment would produce. The other reports a field trial that found no harm. The gap between them is the permitting question: what counts as a “realistic” perturbation when regulators write environmental review protocols for marine CDR? ...

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. ...