Carbon removal has become an essential piece of our response to climate change, as the UN’s climate change committee pointed out in a report last year. Estimates of exactly how much carbon we’ll need to remove vary, but the consensus is that it will need to top a billion tons annually within the next few decades if we’re going to keep warming below 2 °C over preindustrial levels and avoid the worst effects of climate change.

https://www.technologyreview.com/2023/06/22/1075387/seaweed-farming-carbon-removal/