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Carbon capture and storage (CCS) is a proposed route to mitigate fossil-fuel greenhouse gases' impact on Earth. In CCS, CO2 is captured from fuel burning at the power station, and pumped back down into the very rocks that maybe once yielded that fuel. Likely storage sites for CO2 will be depleted gas and oil fields one to two km down. Attention has now turned to monitoring CO2's behaviour at depth. Checking that it stays locked within the porous rocks of any CCS repository is an important step in validating the method. [Source: BBC News]
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