Yep, Texas earthquakes were caused by CO2 injection wells:
http://ca.news.yahoo.com/co2-injections-likely-culprit-texas-earthquakes-study-004939487--finance.html
This puts the lie to the concept of CO2 sequestration by injection. If such a thing were to be done on a large scale, the gas would escape MUCH faster than the 40 year criteria currently proposed.
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