Andernach (IMAGE) Heidelberg University Caption Temperature-dependent change of the CO2 isotope distribution: At low temperatures, a molecule with rare isotopes occurs much more frequently. The photo shows the escape of CO2 from a hydrothermal system, the Andernach geyser. Credit Figure: I. Prokhorov Usage Restrictions This image may be used only in connection with the contents of this press release, and the source of the image must also be cited. License Licensed content 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.