Enhanced Rock Weathering’s Scaling Bottleneck Is Proof, Not Rock

Get in touch - leave me a message Enhanced rock weathering looks deceptively simple: crush suitable rock, spread it on farmland and let chemistry remove CO₂. The harder question is whether you can prove that removal reliably enough to make the economics work. I speak with Chris Zair, Director of Partnerships at UNDO, about what happens when enhanced rock weathering moves from controlled trials into real fields. For buyers, investors and policymakers, the stakes are practical: measurement and verification can account for roughly half the cost stack, and weak data can stop credible carbon removal from becoming financeable infrastructure. We look at why disappearing rock creates an unusual MRV problem, what changes when carbon-credit contracts pay only on delivery, and why having plenty of rock and farmland still does not guarantee scale. We also examine the trade-off between durability, cost and speed - including why particle size can radically alter how quickly CO₂ is removed. Listen now to understand what is really holding back enhanced rock weathering - and what has to change for carbon removal to become measurable, financeable and repeatable at scale. Sign up to Climate Confident+ for deep dive analysis of the major climate and energy stories of the day. Support the show Podcast subscribers I'd like to sincerely thank this podcast's amazing subscribers: Anita Krajnc Cecilia Skarupa Ben Gross Jerry Sweeney Andreas Werner Stephen Carroll Roger Arnold And remember you too can Subscribe to the Podcast  - it is really easy and hugely important as it will enable me to continue to create more excellent Climate Confident episodes like this one, as well as give you access to the entire back catalog of Climate Confident episodes. 🎤 Looking for a keynote speaker on climate, energy, AI, or sustainability? I help executive audiences understand the technologies, trends, and decisions shaping the low-carbon transition.  Download my Speaker Pack: https://tinyurl.com/spkrpck And a quick note before you go: I’ve started a new Reddit community for serious, evidence-led discussion on climate solutions, clean energy, decarbonisation, policy, technology, and what actually works in practice.  If you’d like to suggest future guests, challenge ideas from the show, or share climate reports and solutions worth discussing, join us at r/ClimateConfident