Made-from-CO2 concrete, lululemons and diamonds spark investor excitement

A Jewelry worker works at a steam cleaning machine in a workshop at RFG Manufacturing Riviera jewelry design facility in Manhattan in New York City, New York, U.S., September 30, 2021. Picture taken September 30, 2021. REUTERS Mike Segar

(Reuters) - What do diamonds, sunglasses, high-end lululemon sportswear and concrete have to do with climate change?

They can all be made using carbon dioxide (CO2), locking up the planet warming gas. And tech startups behind these transformations are grabbing investor attention.