California startup to ‘sponge’ CO2 from the atmosphere

Scrubbing carbon dioxide from the air is imperative if humanity is to limit global warming, experts say, and a California startup says it can do just that, using limestone as a carbon-sucking sponge.The UN Panel on Climate Change (IPCC), which steers the COP meetings, considers the deployment of carbon capture and storage systems to be unavoidable if we are to limit global warming to 1.5 degrees Celsius above pre-industrial levels.