Capturing and storing CO2

The microscopic image (left) shows just how porous sandstone is. The pore space is coloured blue. This is where the CO2 can be stored. 500 µm is the equivalent to half a millimetre. To the right is a close-up image of the sandstone that occurs as a saltwater-bearing rock stratum at a depth of one thousand metres. As saline aquifers, these storage areas have enough capacity to store the CO2 produced from all fossil-fuelled power plants in Germany for more than twenty years.