This project removes CO₂ from the atmosphere by harnessing the natural weathering process of olivine, a mineral found all over the world. The olivine is ground up and used outdoors on things like pathways, parking lots, and railway lines. Depending on sediment transfer, olivine weathering can result in the alkalization of runoff and/or the formation of carbonate precipitates. This leads to the safe and permanent storage of CO₂.

greenSand is equipped with a special tracking system whereby each tonne of CO₂ purchased has a unique identifier linking it to the specific location where the olivine is located.