Ocean fertilization is a proposed method for CO2 removal in which large quantities of micro- or macronutrients are introduced into marine areas with low biological productivity to stimulate the growth of phytoplankton.
Enhanced weathering techniques involve spreading large amounts of crushed rocks (particularly silicate minerals) onto farmland or beaches, or dumping them into the sea, in order to react with and fix atmospheric carbon dioxide into the oceans and soils.
Marine Cloud Brightening (or Cloud Reflectivity Enhancement) aims to increase the whiteness of clouds in order to reflect more sunlight back into space.
