The reference to "underwater" storage of CO2 could be
misleading. It is true that the Sleipner and Utsira formations
underlie the North Sea, but similar techniques can be (and are)
applied successfully to reinject CO2 into aquifers or oil
reservoirs beneath dry land. It is important not to confuse this
technique with releasing CO2 into deep ocean waters, an idea
that certainly has its supporters but also raises a number of
environmental questions. However, if storage underground is to
make a significant impact on our greenhouse gas emissions, there
are also questions to be answered, such as: how will CO2 behave
underground? And what are the risks of it returning to the
surface? To continue reading this article, subscribe to receive
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