Closed Loop (image) The Earth Institute at Columbia University Share Print E-Mail Caption Engineers and scientists have designed a system to pump volcanic gases including carbon dioxide back into the earth, where the CO2 turns into a solid. Left to right, engineer Magnus Thor Arnarson, Lamont-Doherty Earth Observatory hydrologist Martin Stute and project leader Edda Sif Arradotir of Reykjavik Energy inspect the downgoing piping system. Credit Kevin Krajick/Lamont-Doherty Earth Observatory Usage Restrictions Credit must be given. Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.