“A startup that uses an electrochemical method to remove carbon from seawater is building its first commercial-scale plants in Singapore and Quebec. Removing the carbon boosts the ocean’s ability to soak up more from the atmosphere. The U.S. government recently awarded it and a competitor with a similar approach some of the first federal funding for carbon removal. 

Another startup is set to pour about 9,000 tons of sand mixed with a yellow-green mineral called olivine near the waters off North Carolina’s Outer Banks. When the sand dissolves in water, it triggers a series of chemical reactions that drive carbon removal.”

From Wall Street Journal.