Membrane and Molecules (IMAGE) CSIRO Australia Caption Artist's impression of a plastic membrane allowing carbon dioxide to move through its hourglass-shaped pores while preventing the movement of methane. Credit CSIRO Usage Restrictions None 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.