Johan Rockström of the Potsdam Institute for Climate Impact Research, who is one of the chief scientific advisers to the UN and the Cop30 presidency, said 10bn tonnes of carbon dioxide needed to be removed from the air every year even to limit global heating to 1.7C (3.1F) above preindustrial levels.
He was joined by more leading climate scientists in The Guardian article.
Their message is clear: to avoid climate tipping points and reverse overshoot, we will need hundreds of gigatons of CDR.
Rockström also argues that the Cop30 presidency should put carbon removal in its declarations to focus attention on the risks and costs ahead.
