"If you're got a power plant burning mountains of coal and releasing clouds of carbon dioxide into the air through its smokestacks, solving the problem sounds simple in theory. All you have to do is catch the CO2 as it drifts upward through the pipe and stick it somewhere it won't cause any problems (like underground or deep in the ocean). This idea is called carbon capture and storage (CCS). It's an artificial version of carbon sequestration, which is what plants and trees do..." (Quoted from article)