Take: Dr. Sambuddha Misra: Drinking Tea to Save Coral Reefs? The Mechanics of Enhanced Rock Weathering in Darjeeling | S5E5
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. ...