Andrew Leakey, University of Illinois (image) University of Illinois at Urbana-Champaign Caption University of Illinois plant biology professor Andrew Leakey and colleagues report that levels of zinc, iron and protein drop in some key crop plants when grown at elevated CO2 levels. Credit L. Brian Stauffer Usage Restrictions Image may be used only to accompany stories about the research described in this release. Credit required: L. Brian Stauffer 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.