SoyFACE Carbon Dioxide Ring (image) University of Illinois College of Agricultural, Consumer and Environmental Sciences Share Print E-Mail Caption Students gather in an elevated carbon dioxide ring at the SoyFACE Global Change Research Facility located at the University of Illinois in Urbana. Within this 20-meter ring, the carbon dioxide concentration is raised from the current atmospheric level of 385 ppm to the level predicted for the middle of this century of 585 ppm by releasing pure carbon dioxide through laser drilled holes in the green pipes surrounding the crop. Credit Jennifer Shike, University of Illinois Usage Restrictions For use only with University of Illinois release titled, 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.