Yes, in some places there are pockets of CO2 that can be drilled just like natural gas.
Here is a company out of Texas that drills for and uses CO2:
Denbury Resources Inc. http://www.denbury.com/CO2Assets.htm
Jackson Dome
We believe that having sufficient CO2 volumes is the key ingredient, if not the most important factor to our tertiary operations. We acquired our Jackson Dome CO2 source field in February 2001, giving us control of most of the CO2 supply in Mississippi, as well as ownership and control of the critical 183-mile NEJD CO2 pipeline. Since February 2001, we have acquired two additional wells and drilled 15 additional CO2 producing wells, significantly increasing our estimated proved CO2 reserves from 800 Bcf at the time of acquisition to approximately 5.6 Tcf as of December 31, 2007, replacing 164% of our production during 2007. Today, we own every producing CO2 well in the region. We plan to drill several additional CO2 wells during 2008, including four development wells and one exploratory well, to further increase our proven CO2 reserves and to obtain additional CO2 deliverability.