If they do it right, they could create a pressurized cave system that they could seal and use to control release of gas. It's an analog battery, and the gas can be burnt for maximum capture. I know what you're thinking though

>But isn't the point not to burn gas and not make co2?

No, the point is to screw over everyone who isn't in their wealthy club of degeneracy and all of us will be dead and climate change will be "solved" when they realize how broken their models were in a few centuries. They will either never admit it or just quietly say something and step over the fact that they used it as an excuse to screw everyone over, like they did with COVID "amnesty" 😤.