Podcast-Take

Take on a podcast episode from Reversing Climate Change, originally published Thu, 07 Ma. Listen: https://podcasters.spotify.com/pod/show/reversingclimatechange/episodes/398-Scientists-vs--Engineers---the-Commercial-Pressure-on-Carbon-Dioxide-Removalw-Erica-Dorr--Samara-Vantil--Rainbow-e3j0jq0 TL;DR Rainbow’s head of science Erica Dorr and certification engineer Samara Vantil reframe the science-vs-engineering split as a false binary; both do applied work daily. The real gap is technical-vs-commercial. Useful framing for anyone who’s watched a salesperson promise a methodology change on a call. Concrete example: biochar lab samples cost ~€600 to ship Africa→Europe. That’s the kind of number that should anchor measurement, reporting, and verification (MRV) requirement-setting. Defense of Charm’s “cut scope” posture as courage, not laziness — diminishing returns on the last sample are real and worth saying out loud. When project developers can’t deliver a data point, Rainbow’s default is a conservative discount factor, not rejection. Worth knowing if you’re a buyer reading their credits. Ross Kenyon hosts Erica Dorr (head of science) and Samara Vantil (environmental engineer, certification) of Rainbow, the carbon removal standard and registry. The episode is a follow-up to two essays Kenyon wrote for Rainbow on whether durable CDR needs more field engineers or more scientists, and lands somewhere more interesting than either piece: the science/engineering line is fuzzy, and the harder boundary is between technical teams and commercial. ...

Take on a podcast episode from REEF Roundup: 🪸Coral Reefs🐠 and 🐙Marine Conservation🦈, originally published Wed, 15 Ap. Listen: https://podcasters.spotify.com/pod/show/reefroundup/episodes/Dr--Sambuddha-Misra-Drinking-Tea-to-Save-Coral-Reefs--The-Mechanics-of-Enhanced-Rock-Weathering-in-Darjeeling--S5E5-e3hsh58 TL;DR Alt Carbon’s chief scientist explains why Darjeeling’s foothills are a rare “supply-limited” weathering regime — solid mechanistic justification for site selection. 2025 Isometric-verified delivery claimed as Asia’s first enhanced rock weathering (ERW) credits; guest says next tranche is ~10x larger. Useful datapoint on Asian ERW supply. Current deployment ~80,000 acres, roadmap to 250k then 1M acres across Bengal and Assam. Ambition is real but measurement is the bottleneck. Honest admission: a million-acre deployment implies ~3M samples/year, more than all geochemistry has measured historically. New measurement, reporting, and verification (MRV) methods required. Reported 25–100% crop yield uplift on degraded tea-estate soils from basalt micronutrients. Eye-catching, but no controls described — take with caution. Reef Roundup (a marine conservation show) hosts Dr. Sambuddha Misra, IISc earth scientist and chief scientist at Alt Carbon, for a surprisingly substantive walk through the geochemistry, MRV, and scaling math of enhanced rock weathering in the Himalayan foothills. The framing is coral-reef alkalinity, but the meat is durable CDR: basalt sourcing, supply-limited weathering regimes, Isometric verification, and the brick wall of sample-scale measurement. ...

Take on a podcast episode from The CDR Policy Scoop, originally published Sun, 03 Ma. Listen: https://shows.acast.com/the-cdr-policy-scoop/episodes/fixing-permanence-insurance-and-the-permanence-trust-with-na TL;DR Natalia Dorfman (Kita CEO) argues buffer pools were a useful bootstrap but not built for perpetual liability — a defensible position, gaining traction with standards themselves. Frames permanence as two distinct problems: short-term liability (handle via insurance on the developer) vs long-term/perpetual (needs a fund mechanism). Useful clean split. The Permanence Trust: an endowment-style, fully capitalized fund where per-credit fees are invested so the corpus always exceeds expected reversal costs. AFF-led feasibility study, report due ~June 2026, pilot to follow. Expects multiple Permanence Trusts (per-jurisdiction, per-standard), not one global fund. Realistic, though fragmentation risk goes unaddressed. Interim move: insurance-wrapped buffers so standards stop “holding the bag.” Practical bridge, but no costs disclosed on-air. Eve Tamme and Sebastian Manhart host Natalia Dorfman of Kita for a 30-minute walk through where carbon insurance has landed in 2026 and, more substantively, the Permanence Trust concept being developed by the American Forest Foundation with Kita as modeling partner. If you’ve been hearing “permanence trust” in conference hallways and wondering what’s actually under the hood, this is the cleanest public explanation so far. ...

Take on a podcast episode from The Carbon Curve, originally published Thu, 30 Ap. Listen: https://carboncurve.substack.com/p/carbon-removal-is-stuck-in-low-earth Naim Merchant hosts Julio Friedmann, Chief Scientist at Carbon Direct, to unpack the firm’s new “CDR 2.0” report. The thesis: durable carbon removal has reached “low Earth orbit” — markets, registries, raters, a buyers coalition all exist — but the next stage requires a different operating model. Friedmann lays out five pillars: technical readiness, project assurance, standardization, bankability, and transactional ease. ...

Take on a podcast episode from The CDR Policy Scoop, originally published Wed, 29 Ap. Listen: https://shows.acast.com/the-cdr-policy-scoop/episodes/digging-deep-with-gabrielle-walker-a-life-in-climate TL;DR Long-form interview with Gabrielle Walker (CUR8, Rethinking Removals) — part biography, part state-of-the-CDR-market read. Worth it for the second half. Walker’s “pre-compliance” framing for 2026-2035: SBTi draft reportedly requires removals by 2035, ISO net-zero standard (due later this year) will mandate interim removal targets. Useful if accurate. British Airways portfolio anecdote: Sean Doyle reportedly sees CDR as ~30% of BA’s decarbonization solution. First time I’ve seen that number cited publicly. CUR8’s 5-pillar diligence framework (climate integrity, team, future potential, delivery risk, “core benefits” not co-benefits) — practical, steal-able. Honest moment: Walker admits she initially dismissed Global South CDR as virtue-signaling before James Wanjigi (Kenya) changed her mind. Worth hearing. Episode link. Sebastian Manhart and Eve Tamme launch a long-form spinoff of the CDR Policy Scoop with Gabrielle Walker — co-founder of CUR8 and Rethinking Removals, and one of the people who has actually been in rooms with FTSE-100 CSOs trying to convert intent into off-takes. The first 60% is biography (Antarctica, ice cores, science journalism); the back half is the part practitioners want. ...