Temperature Trends (IMAGE) University of California - San Diego Caption This graph shows observed global mean surface temperature (GMST) based on three datasets (black curves in degree C), and the new estimates of anthropogenic global warming (AGM). The simulated GMST change without considering tropical Pacific internal variability is plotted as reference (white curve with blue shading indicating the uncertainty). Credit Nature Geoscience Usage Restrictions Must credit Nature Geoscience 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.