Here, we approximate their maximum additions to assess potential consequences for pelagic communities (mainly primary producers) and the biogeochemical fluxes they control. However, the desired consumption of atmospheric CO 2 during dissolution would inevitably be accompanied by a release of mineral dissolution products (alkalinity, Si, Ca, Mg, Fe, Ni, and maybe others). Acceleration could be realized by pulverizing and distributing gigatons of these minerals onto land (termed “enhanced weathering (EW)”) or sea (termed “ocean alkalinity enhancement (OAE)”) thereby largely increasing their reactive surfaces. A widely recognized idea is to accelerate weathering reactions of minerals that consume CO 2 when they dissolve. However, so far it is unclear if and how this could be achieved. Humankind will need to remove hundreds of gigatons of carbon dioxide (CO 2) from the atmosphere by the end of the twenty-first century to keep global warming below 2☌ within the constraints of the global carbon budget.