Admittedly, pumping huge amounts of carbon dioxide into underground caverns sounds audacious. If the US captured just 60 percent of the CO2 emitted by its coal-burning power plants and reduced it to a liquid for injection underground, the daily volume would roughly equal what the US consumes in oil each day – about 20 million barrels, according to a report by the Massachusetts Institute of Technology in Cambridge. And the risks are substantial.
Inject too much CO2 and the resulting pressure could cause earth tremors or push deep super-salty groundwater up into freshwater aquifers. Once pumped in, the CO2 may not even stay put in the sandstone formations, below layers of shale and other rock.
Mark Clayton
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