Start removing the carbon Terradot takes a competitor Aeonboth companies announced today. The sale is driven mainly by large investors such as sovereign wealth funds, who want to work with companies that can handle large contracts. Eion is very small, Eion CEO Anastasia Pavlovic Hans SPOKE The Wall Street Journal.

Both companies spread powdered rocks on fields to absorb carbon dioxide from the atmosphere. Known as enhanced rock weathering (EWR), this accelerates the natural process and has the potential to be a cheap way to remove carbonbut this requires large and distributed operations. The spread between what EWR companies are willing to pay and what buyers are willing to pay remains wideaccording to a CDR survey.fyi.

California-based Terradot’s operations are centered in Brazil, where the company works with basalt as its mineral of choice, while Eion works in the US and uses olivine. Terradot’s investor list includes Gigascale Capital, Google, Kleiner Perkins, and Microsoft, while Eion’s investors include AgFunder, Mercator Partners, and Overture.