According to Physics Today, a recent report by the National Research Council (NRC) warns that the injection of millions of tons of supercritical liquid carbon dioxide from fossil-fuel plants into deep geological formations is likely to create earthquakes and allow the greenhouse gas to escape into the atmosphere. But other scientists disagree, saying that if sites are chosen carefully the risk of CO2 finding its way back to the surface is low.
There does seem to be a growing consensus that the cost of sequestration is making this option less attractive than other alternatives and that the risk of seismic activity is one more thing that could raise the cost of CCS.
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