greenSandEnkhuizen, Noord-Holland, Netherlands
Removes CO2 using Olvine
greenSand focuses on removing certified CO2 using the mineral Olivine. Removal by reactions with olivine is an attractive option, because it is widely available and reacts easily with the (acid) CO2 from the atmosphere. When olivine is crushed, it weathers within a couple of years, depending on the grain size and humidity. The reaction is exothermic but slow. The end-products of the reaction are silicon dioxide, magnesium carbonate, and small amounts of iron oxide.