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CO2 Injection

The major categories of geological formations being considered for CO2 storage include depleted oil and gas reservoirs, deep beds of unmineable coal, and deep saline aquifers (see the Climopedia entry, "Most experts agree stored CO2 will stay underground for centuries" for basic information on the security of storage sites"). This graphic depicts CO2 injection into an underground saline aquifer at least a half mile below the surface The aquifer a porous layer of rock and sand, above which is a solid "cap rock" that prevents the CO2 from finding its way back to the surface. This depth ensures that the pressure created by the overlying material keeps the CO2 in a liquid form and that the CO2 is isolated from surface water and from shallower underground drinking water aquifers.

For more information on the distribution of storage sites see a microanimation on CO2 storage areas and the Climopedia entry, "Deep rock formations thought suitable for CO2 storage abound in the US".

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