Put in petrol/coal plants or near big cities. Carbon capture machine.
https://qz.com/1100221/the-worlds-first-negative-emissions-plant-has-opened-in-iceland-turning-carbon-dioxide-into-stone/?utm_source=parSA
"But what Climeworks and its competitors are showing is that, if direct air capture can be made cheap enough for there to be commercial interest, then carbon capture at point-sources will likely work, too."