Stock Photo - An employee of the Potsdam geo research centre stands on a platform in Ketzin, Germany, 13 September 2017. After 13 years, an experiment concerning the storage of carbon dioxide in sandstone ends here. In the years between 2008 and 2013 67,000 tons of carbon dioxide were pumped in porous sandstone on a trial basis up until a depth of 650 metres. Until 2017, the drillings were scientifically observed. Photo: Ralf Hirschberger/dpa-Zentralbild/ZB. - Ketzin/Brandenburg/Germany

Stock Photo: An employee of the Potsdam geo research centre stands on a platform in Ketzin, Germany, 13 September 2017. After 13 years.

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