Enhanced Weathering is a geoengineering carbon dioxide removal approach that utilizes chemical reactions between rocks/minerals and CO2 to reduce CO2 in the atmosphere. To carry out Enhanced Weathering, silicate (or carbonate) containing rocks such as olivine are ground up into a powder and incorporated into the soils of agricultural areas (or on beaches). The silicate containing rock powder reacts with water and CO2 to form bicarbonate ions (HCO3-). This reaction effectively removes CO2 from the atmosphere. The bicarbonate ions, which are dissolved in water, eventually end up in the ocean where calcifying organisms (such as corals and some plankton) convert the bicarbonate to calcium carbonate (CaCO3). The calcium carbonate eventually sinks to the bottom of the ocean.