
"The exhaust must be compressed and liquified to inject it into the ground. Most of the heat must be removed from the exhaust in order to compress it. In a normal coal-fired powerplant, a large fraction of the waste heat is rejected by simply venting the exhaust into the air. In a CO2 sequestrating facility, you need a big heat exchanger and a cooling tower to do that work. Oh, and a larger fresh water supply."
The link to the entire article is here