Carbon Dioxide Emissions in Gigatons (IMAGE) Carnegie Institution for Science Caption This graph shows projected decline of carbon dioxide emissions in gigatons (billions of tons) from existing energy and transportation infrastructure (red wedge) over the next 50 years, compared to three emissions scenarios (dotted lines) from the Special Report on Emissions Scenarios Intergovernmental Panel on Climate Change. High, middle, and low emissions projections correspond to the SRES A1G-FI, A2, and B1 scenarios, respectively. Credit Steve Davis 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.