There are a number of ideas for turning carbon dioxide into concrete, carbon nanotubes, or other useful products:

Four teams are working on ways to use carbon dioxide in concrete: CarbonCure Technologies Inc. of Dartmouth, Nova Scotia; Carbon Upcycling UCLA, which is affiliated with the University of California, Los Angeles; Montreal-based Carbicrete; and Carbon Capture Machine Ltd. of Aberdeen, Scotland…

Another four teams are making fuel, plastics or chemical feedstocks: India-based Breathe; C4X of Suzhou, China; CERT, from the University of Toronto; and Huntington Beach, California-based Newlight Technologies.

Two teams are making carbon nanotubes and nanoparticles, which are used in a broad range of products: C2CNT of Ashburn, Virginia, and Carbon Upcycling Technologies of Calgary.