Mati Carbon uses Enhanced Rock Weathering (ERW) in tropical agriculture. They spread crushed basalt on fields; the heat, humidity, and root activity dissolve the rock, reacting with CO₂ to form stable bicarbonates that wash into the ocean. The chemistry is text-book.
The challenge is “MRV” (Measurement, Reporting, Verification) in messy, open systems like flooded rice paddies. Impact: High Potential (Gigaton Scale). Basalt is abundant. Rice paddies are everywhere. If the logistical chain holds, this scales massively. This isn’t magic; it’s geology on fast-forward. The main scientific hurdle is proving exactly how much CO₂ was captured in a specific field.